List of free and open-source software packages

This article is about software free to be modified and distributed. For examples of software free in the monetary sense, see List of freeware.

This is a list of free and open-source software (FOSS) packages , computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software; the GNU project in particular objects to their works being referred to as open-source. ^[1] For more information about the philosophical background for open-source software, see free software movement and Open Source Initiative. However, nearly all software meeting the Free Software Definition also meets the Open Source Definition and vice versa. A small fraction of the software that meets either definition is listed here. Some of the open-source applications are also the basis of commercial products, shown in the List of commercial open-source applications and services.

Artificial intelligence

Main article: Open-source artificial intelligence

General AI

• OpenCog – A project that aims to build an artificial general intelligence (AGI) framework. OpenCog Prime is a specific set of interacting components designed to give rise to human-equivalent artificial general intelligence.

Large language models

• DeepSeek - R1 reasoning model released as an open-source artificial intelligence project on January 20, 2025. ^[2]

• DBRX - Open source LLM

• GPT-J - LLM with 6 billion parameters developed by the nonprofit EleutherAI

• GPT-1 - OpenAI LLM released under the MIT License in June 2018

• GPT-2 - OpenAI LLM released under the MIT License in November 2019

• XLNet - Google LLM released as an open source project in June 2019 under the Apache 2.0 license

• BERT - Google LLM released as an open source project in October 2018 under the Apache 2.0 license

• T5 - Google LLM released as an open source project in 2019 under the Apache 2.0 license

Computer vision

• AForge.NET – computer vision, artificial intelligence and robotics library for the .NET framework
• OpenCV – computer vision library in C++

Machine learning

• See List of open-source machine learning software
• See Data Mining below
• See R programming language – packages of statistical learning and analysis tools

Planning

• TREX – Reactive planning

Robotics

• Gazebo
• Robot Operating System (ROS)
• Webots – Robot simulator

Assistive technology

Speech (synthesis and recognition)

• CMU Sphinx – Speech recognition software from Carnegie Mellon University
• Emacspeak – Audio desktop
• ESpeak – Compact software speech synthesizer for English and other languages
• Festival Speech Synthesis System – General multilingual speech synthesis
• Modular Audio Recognition Framework – Voice, audio, speech NLP processing
• NonVisual Desktop Access – (NVDA) Screen reader, for Windows
• Text2Speech – Lightweight, easy-to-use Text-To-Speech (TTS) Software

Other assistive technology

• Dasher – Unique text input software
• Gnopernicus – AT suite for GNOME 2
• Virtual Magnifying Glass – A multi-platform screen magnification tool

CAD

Main category: Free computer-aided design software

• Art of Illusion
• Blender
• BRL-CAD – a constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system.
• FreeCAD – Parametric 3D CAD modeler with a focus on mechanical engineering, BIM, and product design.
• HeeksCAD
• LibreCAD – 2D CAD software using AutoCAD-like interface and file format.
• MakeHuman
• MeshLab
• Open Cascade Technology (OCCT) – a CAD kernel for 3D CAD, CAM, CAE, etc.
• OpenSCAD – A scripting-based 3D CAD software.
• SolveSpace – 2D and 3D CAD, constraint-based parametric modeler with simple mechanical simulation abilities.
• Sweet Home 3D
• Wings 3D

Computer-aided engineering (CAE)

See also: List of computer-aided engineering software

• Advanced Simulation Library
• ASCEND
• DWSIM
• Elmer FEM solver
• Gmsh
• LibreCAD
• MapleSim
• Modelica
• OpenSim
• OpenFOAM
• Project Chrono
• Salome
• SimScale
• SU2 code

Computer-aided manufacturing (CAM)

Subtractive

• LinuxCNC
• FreeCAD Path Workbench

Additive Manufacturing

• Cura
• Slic3r
• MeshLab
• OctoPrint
• Marlin
• Klipper
• Repetier-Host
• AstroPrint

Electronic design automation (EDA)

Main category: Free electronic design automation software

See also: Comparison of EDA software

See also: List of free electronics circuit simulators

• Electric
• FreePCB
• Fritzing – a CAD software for the design of electronics hardware to build more permanent circuits from prototypes
• gEDA
• GNU Circuit Analysis Package (Gnucap)
• Icarus Verilog
• KiCad – a suite for electronic design automation (EDA) for schematic capture, PCB layout, manufacturing file viewing, SPICE simulation, and engineering calculation
• KTechLab
• Magic
• Ngspice
• pcb-rnd
• Oregano
• Quite Universal Circuit Simulator (QUCS)
• Verilator
• XCircuit

Computer simulation

Main article: List of free and open-source computer simulation software

• Blender – 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, and motion graphics.
• FreeCad, equivalent of Blender, towards to mechanical engineering
• OpenFOAM – open-source software used for computational fluid dynamics (or CFD).
• FlightGear - atmospheric and orbital flight simulator with a flight dynamics engine (JSBSim) that is used in a 2015 NASA benchmark ^[3] to judge new simulation code to space industry standards.
• SimPy – Queue-theoretic event-based simulator written in Python
• Salome – a generic platform for Pre- and Post-Processing for numerical simulation

Cybersecurity

Main article: Cybersecurity

Antivirus

See also: Antivirus software

• ClamAV – cross-platform antimalware toolkit written in C and C++, able to detect many types of malware including viruses
• ClamWin – free and open-source antivirus tool for Windows and written in C, C++
• Lynis – Security audit tool (set of shell scripts) for Unix and Linux

Data loss prevention

See also: Data loss prevention software

• MyDLP

Data recovery

See also: Data recovery and List of data recovery software

• dvdisaster
• ddrescue
• Foremost
• PhotoRec
• TestDisk

Forensics

See also: Forensic science

• The Coroner's Toolkit
• The Sleuth Kit

Anti-forensics

See also: Anti-forensics

• USBKill
• Tails
• BusKill

Disk erasing

See also: Disk Cleanup

• DBAN
• srm

Encryption

See also: Encryption, Encryption software, and List of cryptographic file systems

• Bouncy Castle
• GnuPG
• GnuTLS
• KGPG
• NaCl
• OpenSSL
• Seahorse
• Signal
• stunnel
• TextSecure
• wolfCrypt
• 7-Zip

Disk encryption

See also: Disk encryption and Disk encryption software

• dm-crypt
• CrossCrypt
• FreeOTFE and FreeOTFE Explorer
• eCryptfs
• VeraCrypt

Firewall

See also: Firewall (computing)

• Firewalld
• Uncomplicated Firewall (ufw)
• Firestarter
• IPFilter
• ipfw
• iptables
• nftables
• M0n0wall
• PeerGuardian
• PF
• pfSense
• OPNsense
• Rope
• Shorewall
• SmoothWall
• Vyatta
• VyOS

Network and security monitoring

Main category: Free network management software

• Snort – Network intrusion detection system (IDS) and intrusion prevention system (IPS)
• OpenVAS – software framework of several services and tools offering vulnerability scanning and vulnerability management

Secure Shell (SSH)

See also: Secure Shell

• Cyberduck – macOS and Windows client (since version 4.0)
• Lsh – Server and client, with support for SRP and Kerberos authentication
• OpenSSH – Client and server
• PuTTY – Client-only

Password management

• Bitwarden
• KeePass
• KeePassXC (multiplatform fork able to open KeePass databases)
• Password Safe
• Mitro
• Pass

Other cybersecurity programs

Main category: Free security software

Data storage and management

Disk cleaning utilities

• BleachBit

Backup software

Main category: Free backup software

Database management systems (including administration)

Main category: Free database management systems

• Apache Cassandra – A NoSQL database from Apache Software Foundation offers support for clusters spanning multiple datacenter
• Apache CouchDB – A NoSQL database from Apache Software Foundation with multi-master replication
• MariaDB – A community-developed relational database management system with pluggable storage engines and commercial support
• PostGIS – Adds support for geographic objects to the PostgreSQL as per Open Geospatial Consortium (OGC)
• PostgreSQL – A relational database management system emphasizes on extensibility and SQL compliance and available for Windows, Linux, FreeBSD, and OpenBSD

Data mining

• Environment for DeveLoping KDD-Applications Supported by Index-Structures (ELKI) – Data mining software framework written in Java with a focus on clustering and outlier detection methods
• FrontlineSMS – Information distribution and collecting via text messaging (SMS)
• Konstanz Information Miner (KNIME)
• OpenNN – Open-source neural network software library written in C++
• Orange (software) – Data visualization and data mining for novice and experts, through visual programming or Python scripting. Extensions for bioinformatics and text mining
• RapidMiner – Data mining software written in Java, fully integrating Weka, featuring 350+ operators for preprocessing, machine learning, visualization, etc. – the prior version is available as open-source
• Scriptella ETL – ETL (Extract-Transform-Load) and script execution tool. Supports integration with J2EE and Spring. Provides connectors to CSV, LDAP, XML, JDBC/ODBC, and other data sources
• Weka – Data mining software written in Java featuring machine learning operators for classification, regression, and clustering
• JasperSoft – Data mining with programmable abstraction layer

Data Visualization Components

• ParaView – Plotting and visualization functions developed by Sandia National Laboratory; capable of massively parallel flow visualization utilizing multiple computer processors
• VTK – Toolkit for 3D computer graphics, image processing, and visualisation.

Disk partitioning software

Main category: Free partitioning software

• GParted
• FIPS (computer program)
• TestDisk

Enterprise search engines

• ApexKB, formerly known as Jumper
• Lucene
• Nutch
• Solr
• Xapian

ETLs (Extract Transform Load)

• Konstanz Information Miner (KNIME)
• Pentaho

File archivers

Main category: Free data compression software

• PeaZip
• 7-Zip

File systems

• OpenAFS – Distributed file system supporting a very wide variety of operating systems
• Tahoe-LAFS – Distributed file system/Cloud storage system with integrated privacy and security features
• CephFS – Distributed file system included in the Ceph storage platform.

Desktop publishing

• Collabora Online Draw and Writer – Enterprise-ready edition of LibreOffice accessible from a web browser. The Draw application is for flyers, newsletters, brochures and more, Writer has most of the functionality too. ^[4]
• Scribus – Designed for layout, typesetting, and preparation of files for professional-quality image-setting equipment. It can also create animated and interactive PDF presentations and forms.
• LyX – A "What You See Is What You Mean" document creation system, LyX makes use of the LaTeX markup macro system for TeX, allowing the elegant creation of documents which match up with the layouts in it for various document classes.

E-book management and editing

• Calibre – Cross-platform suite of ebook software
• Collabora Online Writer – Enterprise-ready edition of LibreOffice accessible from a web browser. Allows exporting in the EPUB format. ^[5]
• Sigil – Editing software for e-books in the EPUB format

Education

E-learning, learning support

Main category: Virtual learning environment

• ATutor – Web-based Learning Content Management System (LCMS)
• Chamilo – Web-based e-learning and content management system
• Claroline – Collaborative Learning Management System
• DoceboLMS – SAAS/cloud platform for learning
• eFront – Icon-based learning management system
• H5P – Framework for creating and sharing interactive HTML5 content
• IUP Portfolio – Educational platform for Swedish schools
• ILIAS – Web-based learning management system (LMS)
• Moodle – Free and open-source learning management system
• OLAT – Web-based Learning Content Management System
• Omeka – Content management system for online digital collections
• openSIS – Web-based Student Information and School Management system
• Sakai Project – Web-based learning management system
• SWAD – Web-based learning management system

Academic advising

• FlightPath – Academic advising software for universities

Educational suites for children

• Tux Paint – Painting application for 3–12 year olds
• GCompris – Educational entertainment, aimed at children aged 2–10

Language

• Alpheios Project
• Anki (software)
• FirstVoices
• Kiten

Operating systems

• Linux - Unix-based general use OS
• UberStudent – Linux-based operating system and software suite for academic studies
• MAX (operating system)
• Edubuntu

Mind mapping & others

• Vym (software)
• Compendium (software)
• Gnaural – Brainwave entrainment software

Offline learning & Open data

Main articles: Offline learning and Open data

• Kiwix: A free and open-source offline web browser that allows users download Wikipedia entire content and use for offline learning, later was expanded with repositories for Wikimedia Foundation, public domain texts from Project Gutenberg, many of the Stack Exchange sites, and other resources.
• OpenStreetMap: OpenStreetMap was developed in 2004, it uses Open data and users data input through Crowdsourcing and Web mapping to create a complete and downloadable alternative to other online maps, this allow users to enter data when there is no data available due to lack of governance and economic interest or due lower population of the places mapped

Typing

• KTouch – Touch typing lessons with a variety of keyboard layouts
• Tux Typing – Typing tutor for children, featuring two games to improve typing speed

Engineering

See also: List of open-source computer aided engineering software

• Advanced Simulation Library
• ASCEND
• Calculix
• CHEMKIN - chemical kinetics
• COCO simulator - chemical process simulator
• CP2K - quantum chemistry and solid-state physics
• DWSIM - chemical process simulator
• General Mission Analysis Tool (GMAT) - space mission analysis
• GNU Octave - numerical-analysis
• GROMACS - simulations of proteins, lipids, and nucleic acids.
• JSBSim - flight dynamics engine
• LAMMPS - Molecular dynamics
• Open Babel - chemical informatics
• OpenModelica - chemical process simulator
• OpenSees - earthquake engineering
• OpenVSP - parametric aircraft geometry tool
• Pyomo - mathematical optimization
• REFPROP - Reference Fluid Thermodynamic and Transport Properties
• XFOIL - analysis of subsonic isolated airfoils

File formats

2D

Raster imagery

See also: Ghostscript, OpenRAW, LibRaw, and dcraw

• .apng - Animated Portable Network Graphics
• .avif - AV1 Image File Format
• .bpg - Better Portable Graphics
• .exr - OpenEXR
• .fits - Flexible Image Transport System primarily for Astronomy
• .flif - Free Lossless Image Format
• .gif - Graphics Interchange Format
• .iff / .lbm - InterLeaved BitMap
• .jng - JPEG Network Graphics
• .jpg or .jpeg - Joint Photographic Experts Group
• .jxl - JPEG XL
• .mng - Multiple-image Network Graphics
• .miff / .mi - Magick Image File Format
• .pam, .pbm, .pgm, .ppm, .pnm - Netpbm file formats
• .pgf - Progressive Graphics File
• .png - Portable Network Graphics
• .qoi - Quite OK Image Format
• .tiff - Tag Image File Format
• .wbmp - Wireless Application Protocol Bitmap Format
• .webp
• .xbm - X BitMap
• .xcf - GIMP
• .xpm - X PixMap

Vector imagery

• .cgm - Computer Graphics Metafile
• .eps - Encapsulated PostScript
• .pdf - Portable Document Format
• .pgml - Precision Graphics Markup Language
• .svg - Scalable Vector Graphics
• .vml - Vector Markup Language, deprecated by SVG.
• .xar - Xar (graphics)

3D

• .3mf - 3D Manufacturing Format
• .amf - Additive manufacturing file format
• .blend - Blender
• .dae - COLLADA
• .dxf - Drawing Exchange Format, publicly documented format, developers can work with it in open-source projects, though not fully open-source itself.
• .fbx
• .gltf/.glb - Graphics Library Transmission Format
• .hdr - Radiance HDR
• .ifc - Industry Foundation Classes
• .iges - Initial Graphics Exchange Specification
• .obj - developed by Wavefront Technologies
• .off - Object File Format
• .ply - Polygon File Format
• .rad - Radiance
• .step/.stp
• .stl
• .usd - Universal Scene Description
• .vrml - Virtual Reality Modeling Language
• .x3d

Video

See also: x264

• .mkv - Matroska
• .ogv - Theora
• .vp8
• .vp9
• .webm

Audio

See also: Advanced Audio Coding, LAME, Resource Interchange File Format, and List of open-source musical notation scorewriters

• .aiff - Audio Interchange File Format
• .flac - Free Lossless Audio Codec
• .ogg
• .opus
• .wav

Document & Text

• .adoc - AsciiDoc
• .epub - Ebook format
• .latex - macro package built on top of TeX for simplification
• .md - Markdown
• .odt - OpenDocument
• .rtf - Rich Text Format
• .tex - high-quality typography for mathematical notation, physics, chemistry, engineering/scientific notation.
• .texinfo

Web and Interactive Media

• .css - Cascading Style Sheets
• .html - HyperText Markup Language
• .json - GeoJSON, JSON-LD, JSON-RPC, JsonML, Smile, UBJSON.

Database & Data Storage

• .avro - Apache Avro
• .csv - Comma-separated values
• .hdf5 - Hierarchical Data Format
• .ods - OpenDocument Spreadsheet
• .orc - Apache ORC
• .parquet - Apache Parquet
• .protobuf - Protocol Buffers developed by Google
• .shp - Shapefile
• .sqlite - SQLite
• .tsv - Tab-separated values
• .xml - Extensible Markup Language

File managers

Main category: Free file managers

Finance

Accounting

See also: Comparison of accounting software

• GnuCash – Double-entry book-keeping
• HomeBank – Personal accounting software
• KMyMoney – Double-entry book-keeping
• LedgerSMB – Double-entry book-keeping
• RCA open-source application – management accounting application
• SQL Ledger – Double-entry book-keeping
• TurboCASH – Double-entry book-keeping for Windows
• Wave Accounting – Double-entry book-keeping

Cryptocurrency

See also: Cryptocurrency

• Bitcoin – Blockchain platform, peer-to-peer decentralised digital currency
• Ethereum – Blockchain platform with smart contract functionality

CRM

See also: Customer relationship management

• CiviCRM – Constituent Relationship Management software aimed at NGOs
• iDempiere – Business Suite, ERP and CRM
• SuiteCRM – Web-based CRM

ERP

See also: Enterprise resource planning

• Adempiere – Enterprise resource planning (ERP) business suite
• Apache OFBiz – A suite of enterprise applications from Apache Software Foundation
• Compiere – ERP solution automates accounting, supply chain, inventory, and sales orders
• Dolibarr – Web-based ERP system
• ERPNext – Web-based open-source ERP system for managing accounting and finance
• ERP5 – Single Unified Business Model based system written with Python and Zope
• iDempiere – Fully navigable on PCs, tablets and smartphones driven only by a community of supporters
• JFire – An ERP business suite written with Java and JDO
• LedgerSMB – A double entry accounting and ERP system written with Perl
• metasfresh – ERP Software
• Odoo – Open-source ERP, CRM and CMS
• Openbravo – Web-based ERP
• Tryton – Open-source ERP

Human resources

• OrangeHRM – Commercial human resource management

Microfinance

• Mifos – Microfinance Institution management software

Process management

• Bonita Open Solution – Business Process Management

Games

Main article: List of open-source video games

Action

• Nexuiz – First-person shooter.
• OpenArena – First-person shooter.
• Red Eclipse – First-person shooter.
• Tremulous – First-person shooter.
• Unvanquished – First-person shooter.
• Xonotic – First-person shooter that runs on a heavily modified version of the Quake engine known as the DarkPlaces engine
• Warsow – First-person shooter fast-paced arena FPS game that runs on the Qfusion engine

Application layer

• WINE – Allows Windows applications to be run on Unix-like operating systems

Chess

• ChessV
• Fairy-Max
• GNU Chess
• PyChess
• XBoard
• Lichess

Educational games

• GCompris – software suite comprising educational entertainment software for children aged 2 to 10
• Tux, of Math Command
• Tux Paint

Video game emulation

Main article: Video game console emulator

• MAME – Multi-platform emulator designed to recreate the hardware of arcade game systems
• MESS – Multi-platform emulator designed to recreate the hardware of video game consoles
• RetroArch – Cross-platform front-end for emulators, game engines and video games
• Snes9x – A Super Nintendo emulator
• Stella – Atari 2600 emulator
• PCSX – A PlayStation emulator designed to recreate the hardware of the original PlayStation system
• PCSX2 – A PlayStation 2 emulator designed to recreate the hardware of PlayStation 2 system
• PPSSPP – A PlayStation Portable emulator designed to recreate the hardware of PlayStation Portable system
• Project64 – A Nintendo 64 emulator
• RPCS3 – A PlayStation 3 emulator designed to recreate the hardware of PlayStation 3 system
• Dolphin (emulator) – A GameCube and Wii emulator designed to recreate the hardware of GameCube and Wii systems
• Citra (emulator) – A Nintendo 3DS and Wii emulator designed to recreate the hardware of Nintendo 3DS systems
• Cemu – A Wii U emulator designed to recreate the hardware of Wii U systems

Music video games

• Frets on Fire

Karaoke

• UltraStar

Rhythm game

• StepMania

Puzzle

• Pingus – Lemmings alternative with penguins instead of lemmings

Sandbox

• Luanti – An open source voxel game engine

Snake games

• GLtron

Simulation

• Endless Sky – Space trading and combat simulation
• FlightGear – Flight simulator

• OpenTTD – Business simulation game in which players try to earn money via transporting passengers and freight by road, rail, water and air
• SuperTuxKart – Kart racing game that features mascots of various open-source projects

Strategy

• 0 A.D. – Real-time strategy video game
• Freeciv – Turn-based strategy game inspired by proprietary Sid Meier's Civilization series
• Glest
• The Battle for Wesnoth – Turn-based strategy video game with fantasy setting

Genealogy

Main category: Free genealogy software

• Gramps (software) – a free and open source genealogy software

Geographic information systems

For a more comprehensive list, see List of open source geographic information system software.

• QGIS – cross-platform desktop geographic information system (GIS) application to view, edit, and analyse geospatial data

Graphical user interface

Desktop environments

Main category: Free desktop environments

Window managers

Main category: Free X window managers

Windowing system

Main category: Free windowing systems

Groupware

Main category: Free groupware

Content management systems

Main category: Free content management systems

Wiki software

Main category: Free wiki software

Healthcare software

Main articles: List of open-source health software and List of open-source bioinformatics software

Integrated library management software

• Evergreen – Integrated Library System initially developed for the Georgia Public Library Service's PINES catalog
• Koha – SQL-based library management
• NewGenLib
• OpenBiblio
• PMB
• refbase – Web-based institutional repository and reference management software

Image editor

• Darktable – Digital image workflow management, including RAW photo processing
• digiKam – Integrated photography toolkit including editing abilities
• GIMP – Raster graphics editor aimed at image retouching/editing
• Hugin – panorama stitching
• Inkscape – Vector graphics editor
• Karbon – Scalable vector drawing application in KDE
• Krita – Digital painting, sketching and 2D animation application, with a variety of brush engines
• LazPaint – Lightweight raster and vector graphics editor, aimed at being simpler to use than GIMP
• LightZone – Free, open-source digital photo editor software application.
• Luminance HDR – high dynamic range images
• RawTherapee – Digital image workflow management aimed at RAW photo processing

Maps & Navigation

• OpenStreetMap – open geographic database updated and maintained by a community of volunteers via open collaboration.

Mathematics

For a more comprehensive list, see List of open-source software for mathematics.

• ALTRAN
• FriCAS
• GAP (computer algebra system)
• GiNaC
• gnuplot
• Maxima
• Mathomatic
• Normaliz
• SageMath
• Singular (software)
• SymPy
• Yacas

Computer algebra systems

• Axiom
• Cadabra
• Cambridge Algebra System
• CPMP-Tools
• CoCoA
• Erable
• PARI/GP
• Reduce
• Xcas

symbolic manipulation systems

• FORM (symbolic manipulation system)

Statistics

• R – Statistics software

Numerical analysis

• Octave – Numerical analysis software
• Scilab – Numerical analysis software

Geometry

• Geogebra – Geometry and algebra

Spreadsheet

• LibreOffice Calc – spreadsheet component of the LibreOffice package
• Gnumeric – spreadsheet program of the GNOME Project
• Calligra Sheets – spreadsheet component of the Calligra Suite in KDE
• Pyspread – spreadsheet which uses Python for macro programming, and allows each cell to contain data, the results of a calculation, a Python program, or the results of a Python program.

Mobile software

• Celestia (Android, iOS)
• Calligra (Android)
• Collabora Online Libre office for online collaboration and mobile devices. (Android)
• Conversations (Android)
• F-Droid (Android) – app store and software repository
• I2P (Android) – anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication.
• Kiwix: Offline web browser that allows users to download the entire content of Wikipedia for offline learning purposes. (Android)
• Krita (Android)
• Linphone (Android, iOS)
• Maps.me (Android)
• Monal (iOS)
• NetHunter App Store (Android) – fork of F-Droid for Kali NetHunter
• OpenVPN (Android, iOS) – virtual private network (VPN) system that implements techniques to create secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It implements both client and server applications.
• Orbot (Android, iOS) – free proxy app that provides anonymity on the Internet for users of the Android and iOS operating systems. It allows traffic from apps such as web browsers, email clients, map programs, and others to be routed via the Tor network.
• Organic Maps (Android, iOS)
• OsmAnd (Android)
• Quicksy (Android)
• Stellarium (Android, iOS)
• Tor Browser – onion-routed browser by The Tor Project, based on Firefox ESR
• VLC (Android, iOS)
• Wikipedia (Android, iOS) – See also: List of Wikipedia mobile applications

Media

Audio editors, audio management

Main article: Comparison of free software for audio

• Audacity
• Ardour: Professional digital audio workstation
• LMMS: Digital audio workstation

CD/USB-writing software

Main category: Free optical disc authoring software

• Brasero (software)
• cdrtools
• K3b
• X-CD-Roast

Flash animation

• Pencil2D – For animations
• SWFTools – For scripting

Game engines

Main article: List of game engines

• Blender Game Engine – Discontinued 2019
• Godot – Application for the design of cross-platform video games
• MonoGame – C# framework
• Open3DEngine – Based on Amazon Lumberyard
• Stride – (prev. Xenko) 2D and 3D cross-platform game engine originally developed by Silicon Studio

Chess engines

• KnightCap
• Leela Chess Zero – Universal Chess Interface chess engine
• Stockfish – Universal Chess Interface chess engine

Graphics

Main category: Free graphics software

2D

• Pencil2D – Simple 2D graphics and animation program
• Synfig – 2D vector graphics and timeline based animation
• TupiTube (formerly KTooN) – Application for the design and creation of animation
• OpenToonz – Part of a family of 2D animation software
• Krita – Digital painting, sketching and 2D animation application, with a variety of brush engines
• Blender – Computer graphics software, Blender's Grease Pencil tools allow for 2D animation within a full 3D pipeline.
• mtPaint – raster graphics editor for creating icons, pixel art

3D

• Blender – Computer graphics software featuring modeling, sculpting, texturing, rigging, simulation, rendering, camera tracking, video editing, and compositing
• MakeHuman
• OpenFX – Modeling and animation software with a variety of built-in post processing effects
• Picogen – terrain generator
• Seamless3d – Node-driven 3D modeling software
• Wings 3D – subdivision modeler inspired by Nendo and Mirai from Izware.

3D rendering

• Aqsis
• Cycles and EEVEE – Blender rendering
• LuxCoreRender
• MoonRay
• POV-Ray
• Radiance
• Sunflow

Image galleries

Main category: Free image galleries

• Shotwell
• Wikimedia Commons

Image viewers

• Eye of GNOME
• F-spot
• feh
• Geeqie
• Gthumb
• Gwenview
• KPhotoAlbum
• Opticks

Maps

See also: List of GIS data sources, Geographic information system, and GIS Open source software

GeoDa GeoServer GeoTools GRASS GIS GvSIG ILWIS JUMP GIS Kosmo (GIS) Libre Map Project MapWindow GIS

Mapnik MapServer Marble OpenStreetMap OpenLayers PostGIS QGIS SAGA GIS uDig Whitebox Geospatial Analysis Tools

Multimedia codecs, containers, splitters

Main category: Free multimedia codecs, containers, and splitters

Subtitle

• Aegisub
• Gnome Subtitles
• Subtitle Edit

Television

Main article: List of free television software

Main category: Free television software

See also: Comparison of PVR software packages

Video converters

Main category: Free video conversion software

• Dr. DivX
• FFmpeg
• MEncoder
• OggConvert

Video editing

See also: List of video editing software § Free_(libre)_or_open-source

• Avidemux
• AviSynth
• Blender
• Cinelerra
• Flowblade
• Kdenlive
• Kino
• LiVES
• LosslessCut
• Natron
• Olive
• OpenShot
• Open Movie Editor
• Pitivi
• Shotcut
• VirtualDub
• VirtualDubMod
• VideoLAN Movie Creator

DVD authoring

• DeVeDe
• DVD Flick
• DVDStyler

Other media packages

• Celtx – Media pre-production software
• Open Broadcaster Software (OBS) – Cross-platform streaming and recording program

Ripping

• K9Copy
• Thoggen

Video encoders

Main article: Comparison of video codecs

• Avidemux
• HandBrake
• FFmpeg
• OggConvert

Video players

Main article: Comparison of video player software

• Media Player Classic
• VLC media player
• mpv

Networking and Internet

Advertising

• Revive Adserver

Communication-related

• Asterisk – Telephony and VoIP server
• Ekiga – Video conferencing application for GNOME and Microsoft Windows
• ConferenceXP – video conferencing application for Windows XP or later
• Dino - xmpp client, supporting both OMEMO encryption and Jingle Audio/Video protocol, under Windows, Linux and BSD.
• FreePBX – Front-end and advanced PBX configuration for Asterisk
• FreeSWITCH – Telephony platform
• Gajim – xmpp client
• I2P – anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication.
• Jami – Cross-platform, peer to peer instant-messaging and video-calling protocol that offers end-to-end encryption and SIP client
• Jitsi – Java VoIP and Instant Messaging client
• QuteCom – Voice, video, and IM client application
• Enterprise Communications System sipXecs – SIP Communications Server
• Slrn – Newsreader
• Telegram
• Twinkle – VoIP softphone
• Tox – Cross-platform, peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption

E-mail

Main category: Free email software

• Amavis – Email content filter
• Claws Mail – Email Client
• Fetchmail – Email Retrieval
• Geary – Email client based on WebKitGTK+
• GNUMail – Cross-platform email client
• Hula – Discontinued mail and calendar project
• K-9 Mail – Android Email Client
• MailScanner – Email security system
• MH Message Handling System – Email Client
• Modest – Email Client
• Mozilla Mail & Newsgroups – Email Client that was part of the now discontinued Mozilla Application Suite
• Mozilla Thunderbird – Email, news, RSS, and chat client
• POPFile – Cross-platform mail filter
• Roundcube – Web-based IMAP email client
• Sylpheed – Email and News Client
• Sympa – MLA software

File transfer

Main category: Free file transfer software

• Filezilla

Grid and distributed processing

• GNU Queue
• HTCondor
• pexec

Instant messaging

Main category: Free instant messaging clients

IRC Clients

Main category: Free IRC clients

Middleware

• Apache Axis2 – Web service framework (implementations are available in both Java & C)
• Apache Geronimo – Application server
• Bonita Open Solution – a J2EE web application and java BPMN2 compliant engine
• GlassFish – Application server
• Apache Tomcat – Servlet container and standalone webserver
• JBoss – Application server
• OpenRemote – IoT Middleware
• TAO (software) – C++ implementation of the OMG's CORBA standard
• Enduro/X – C/C++ middleware platform based on X/Open group's XATMI and XA standards

RSS, Atom readers, aggregators

• Akregator – Platforms running KDE
• Liferea – Platforms running GNOME
• NetNewsWire – macOS, iOS
• RSS Bandit – Windows, using .NET framework
• RSSOwl – Windows, macOS, Solaris, Linux using Java SWT Eclipse
• Sage (Mozilla Firefox extension)

Peer-to-peer file sharing

Main category: Free file sharing software

See also: Category:Free BitTorrent clients

• I2P – anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication.
• Popcorn Time – Multi-platform, free, and open-source media player
• qBittorrent – Alternative to popular clients such as μTorrent
• Transmission – BitTorrent client
• Deluge – BitTorrent client

Portal Server

• Drupal
• Liferay
• Sun Java System Portal Server
• uPortal

Remote access and management

• FreeNX
• OpenVPN
• rdesktop
• Synergy
• VNC (RealVNC, TightVNC, UltraVNC)
• Remmina (based on FreeRDP)

Routing software

Main category: Free routing software

Web browsers

Main category: Free web browsers

Graphical

• Chromium – web browser using the custom Blink engine from which Google Chrome draws its source code
• Brave – privacy-focused web browser based on Chromium browser
• Falkon – web browser based on Blink engine, a KDE project
• Firefox – Mozilla-developed web browser using Gecko layout engine
• Waterfox – Firefox fork supporting legacy extensions, 64-bit only
• Pale Moon – a customizable fork of Firefox
• Tor Browser – onion-routed browser by The Tor Project, based on Firefox ESR
• GNOME Web – WebKit-based web browser for the GNOME desktop environment
• Midori – Lightweight web browser using the WebKit layout engine
• qutebrowser – keyboard operated Webkit-based browser with vi-like keybindings
• SeaMonkey Navigator – the SeaMonkey internet suite's web browser
• Surf – a minimal tab-less browser by suckless.org using WebKitGTK
• Firefox Focus – privacy-focused mobile web browser from Mozilla available for Android and iOS

Text-based

• Lynx – a text-based web browser developed since 1992
• Links – a text-based browser with a framebuffer-based graphical mode
• ELinks – fork of Links with JavaScript support

Webcam

• Cheese – GNOME webcam application
• Guvcview – Linux webcam application

Webgrabber

• cURL
• HTTrack
• Wget

Web-related

• Apache Cocoon – A web application framework
• Apache Tomcat
• Apache – The most popular web server
• AWStats – Log file parser and analyzer
• BookmarkSync – Tool for browsers
• Caddy – an extensible, cross-platform, open-source web server written in Go.
• Cherokee – Fast, feature-rich HTTP server
• curl-loader – Powerful HTTP/HTTPS/FTP/FTPS loading and testing tool
• Docker – Docker Engine is open-source for Linux only
• FileZilla – FTP
• H2O – supports HTTP/2, TLS, and server push
• Hiawatha – Secure, high performance, and easy-to-configure HTTP server
• HTTP File Server – User-friendly file server software, with a drag-and-drop interface
• lighttpd – Resource-sparing, but also fast and full-featured, HTTP Server
• Lucee – CFML application server
• Nginx – Lightweight, high performance web server/reverse proxy and e-mail (IMAP/POP3) proxy
• NetKernel – Internet application server
• Qcodo – PHP5 framework
• Squid – Web proxy cache
• thttpd – designed for simplicity, small memory footprint, and speed
• Vaadin – Fast, Java-based framework for creating web applications
• Varnish – High-performance web application accelerator/reverse proxy and load balancer/HTTP router
• XAMPP – Package of web applications including Apache and MariaDB
• Zope – Web application server

Web search engines

• Searx – Self-hostable metasearch engine
• YaCy – P2P-based search engine

Other networking programs

• JXplorer – LDAP client
• Nextcloud – A fork of ownCloud
• OpenLDAP – LDAP server
• ownCloud – File share and sync server
• Wireshark – Network monitor

Office software

Text editors

Software	Platform	Formats
AbiWord	Linux, Windows	.txt
Atom (text editor)	macOS 10.9 or later, Windows 7 and later, and Linux	.txt
gedit	Linux, MacOS	.txt
GNOME Text Editor	Linux	.txt
Kate (text editor)	25 Linux distributions, Microsoft Windows, macOS	.txt
Leafpad	Linux, BSD, Maemo	.txt
Metapad	Windows	.txt
Mousepad	Linux, BSD, Maemo	.txt
Notepad++	Windows	.txt
Visual Studio Code	Linux, Windows, MacOS	.txt

Spreadsheet software

Software	Operating system	Format
Gnumeric	Unix-like (Linux included)	.gnm, .gnumeric
GNU Oleo	Linux	.oleo [6]
Pyspread	Unix-like, Windows	.CSV, .XLS, .SVG, .PDF
Sheetster	Cross-platform	JSON, XML, .XLS, .CSV, xlsx/.ooxml, .exml, .zip

Office suites

• Apache OpenOffice – The cross platform office productivity suite from Apache Software Foundation (ASF) consists of programs for word processing, spreadsheets, presentation, diagrams and drawings, databases, etc.
• Calligra Suite – The office productivity suite from KDE consists of programs for word processing, spreadsheets, presentation, databases, vector graphics, and digital painting
• Collabora Online – Enterprise-ready edition of LibreOffice, web application, mobile phone, tablet, Chromebook and desktop (Windows, macOS, Linux) ^[7]
• LibreOffice – The cross platform office productivity suite from The Document Foundation (TDF) consists of programs for word processing, spreadsheets, presentation, diagrams and drawings, databases, etc.
• OnlyOffice Desktop Editors – An open-source offline edition of the Cloud

PDF Editors

• PDFsam Basic edition - A free, open source, platform independent software designed to split, merge, mix, extract pages and rotate PDF files for Windows, Linux, MacOS. Open-source version of their commercial offering.

Operating systems

Be advised that available distributions of these systems can contain, or offer to build and install, added software that is neither free software nor open-source.

Main category: Free software operating systems

• BSD: FreeBSD, OpenBSD, NetBSD, GhostBSD, TrueNAS, MidnightBSD, DragonFly BSD, OPNsense, pfSense, XigmaNAS, among others.
• GrapheneOS
• Kali NetHunter
• Linux: Debian, Ubuntu, Manjaro, Fedora, openSUSE, antiX, NixOS, Kali, Alpine, Tails, Mageia, Slackware, Gentoo, BlackArch, among others.
• LineageOS: An android-based operative system for tablets and mobile phones.
• GNU Hurd
• Mobian
• Plasma Mobile
• PostmarketOS
• PureOS
• Ubuntu Touch
• Redox OS
• FreeDOS – a free OS compatible with IBM PC DOS and Microsoft's MS-DOS
• ReactOS – an open-source OS intended to run the same software as Windows, originally designed to simulate Windows NT 4.0, later aiming at Windows 7 compatibility. It has been in the development stage since 1996.

Emulation and Virtualization

Main category: Free emulation software

Main category: Free virtualization software

• AppleWin
• DOSBox – DOS programs emulator (including PC games)
• GNOME Boxes
• Hercules (emulator)
• Kernel-based Virtual Machine
• QEMU
• VirtualBox – hosted hypervisor for x86 virtualization

Personal information managers

• Chandler – Developed by the Open Source Applications Foundation (OSAF)
• KAddressBook
• Kontact
• KOrganizer
• Mozilla Calendar – Mozilla-based, multi-platform calendar program
• GNOME Evolution
• Perkeep – Personal data store for pictures
• Project.net – Commercial project management
• TeamLab – Platform for project management and collaboration

Programming language support

See also: Comparison of integrated development environments

Programming languages

See also: List of open-source programming languages and List of open source code libraries

Ada Bash C C# C++ Chapel Clojure Crystal D Dart Elixir Erlang F# GNU Fortran Gleam Go

Hack Haskell IDL J Java JavaScript Julia Kotlin Lua Marlin ML Nim Perl PHP Prolog Python

R Racket Ruby Rust Scala Shell SQL Swift Tcl TypeScript V Zig

Source code editors

See also: Source-code editor and List of text editors

Acme Arachnophilia Atom Bluefish Brackets ECCE ed Elvis GNU Emacs Extensible Versatile Editor (EVE) FeatherPad Geany gedit GNOME Text Editor JED

jEdit JOVE JuffEd Kate Kile Komodo Edit KWrite Lapis Language-Sensitive Editor (LSE) Leo Light Table Mousepad GNU nano Neovim Notepad++

nvi SciTE Stevie Textadept Vi vile vim Visual Studio Code Xed XEmacs

Compilers and assemblers

See also: Compiler, Assembler, Interpreter, and List of compilers

Amsterdam Compiler Kit BBC BASIC Bigloo Blitz BASIC BDS C CINT Chez Scheme Chicken Clang Clozure CL CMU Common Lisp Cython EiffelStudio Embeddable Common Lisp FASM Free Pascal FreeBASIC G95 Gambas Gambit GNU Assembler GCC GNU Compiler for Java GNU Common Lisp GNU Fortran GNU Pascal GNU Smalltalk Glasgow Haskell

High Level Assembly IL2CPU Ikarus IronRuby javac Jikes Kawa LCC LibertyEiffel LLVM MIT/GNU Scheme Mono compiler Netwide Assembler Nuitka Numba Open64 PeachPie Phalanger Portable C Psyco Pyjs QB64 ROSE Roslyn rustc SCM Shed Skin

Small-C Small Device C SmartEiffel Stalin Steel Bank Common Lisp TenDRA Tiny C Vector Pascal Watcom C/C++ XPL YARV Yabasic York Haskell Zig Compiler

Bug trackers

• Bugzilla
• Mantis
• Mindquarry
• Redmine
• Trac

Code generators

• Babel – JavaScript transcompiler
• Bison
• CodeSynthesis XSD – XML Data Binding compiler for C++
• CodeSynthesis XSD/e – Validating XML parser/serializer and C++ XML Data Binding generator for mobile and embedded systems
• Flex lexical analyser – Generates lexical analyzers
• Open Scene Graph – 3D graphics application programming interface
• OpenSCDP – Open Smart Card Development Platform
• SableCC – Parser generator for Java and .NET
• SWIG – Simplified Wrapper and Interface Generator for several languages
• ^txt2regex$
• xmlbeansxx – XML Data Binding code generator for C++
• YAKINDU Statechart Tools – Statechart code generator for C++ and Java

Documentation generators

• Doxygen – Tool for writing software reference documentation. The documentation is written within code
• Mkd – Extracts software documentation from source code files, pseudocode, or comments
• Natural Docs – Claims to use a more natural language as input from the comments, hence its name

Configuration software

• Autoconf
• Automake
• CMake

Debuggers (for testing and trouble-shooting)

• GNU Debugger – A portable debugger that runs on many Unix-like systems
• Memtest86 – Stress-tests RAM on x86 machines
• Xnee – Record and replay tests

Integrated development environments

Main category: Free integrated development environments

Version control systems

Main category: Free version control software

Reference management software

See also: Comparison of reference management software

Risk Management

• Active Agenda – Operational risk management and Rapid application development platform

Science

Main category: Free science software

Bioinformatics

See also: List of open-source bioinformatics software

AMAP BAli-Phy BLAST, CS-BLAST, BLAT Bowtie Clustal DECIPHER FASTA Fast statistical alignment HMMER HH-suite JAligner

MAFFT MAVID MUSCLE Nextflow Phyloscan Probalign ProbCons Stemloc T-Coffee UGENE Yass

Cheminformatics

• Chemistry Development Kit
• JOELib
• OpenBabel

Data science

• Apache Hadoop – distributed storage and processing framework
• Apache Spark – unified analytics engine
• ELKI - data analysis algorithms library
• Jupyter Notebook – interactive computing
• Keras – neural network library
• KNIME – data analytics platform
• Matplotlib – data visualization library
• NumPy – numerical computing library
• Orange – data mining tool
• pandas – data manipulation library
• Python
• R – statistical computing language
• SciPy – scientific computing library
• scikit-learn – Python machine learning library
• TensorFlow – machine learning framework
• WEKA – machine learning and data analysis suite

Electronic lab notebooks

• Jupyter

Geographic information systems

Main category: Free GIS software

Geoscience

See also: List of free geology software

Microscope image processing

• CellProfiler – Automatic microscopic analysis, aimed at individuals lacking training in computer vision
• Endrov – Java-based plugin architecture designed to analyse complex spatio-temporal image data
• Fiji – ImageJ-based image processing
• Ilastik – Image-classification and segmentation software
• ImageJ – Image processing application developed at the National Institutes of Health
• IMOD – 2D and 3D analysis of electron microscopy data
• ITK – Development framework used for creation of image segmentation and registration programs
• KNIME – Data analytics, reporting, and integration platform
• VTK – C++ toolkit for 3D computer graphics, image processing, and visualisation
• 3DSlicer – Medical image analysis and visualisation

Molecular dynamics

• GROMACS – Protein, lipid, and nucleic acid simulation
• LAMMPS – Molecular dynamics software
• MDynaMix – General-purpose molecular dynamics, simulating mixtures of molecules
• ms2 – molecular dynamics and Monte Carlo simulation package to predict thermophysical properties of fluids
• NWChem – Quantum chemical and molecular dynamics software

Molecule viewer

• Avogadro – Plugin-extensible molecule visualisation
• BALLView – Molecular modeling and visualisation
• Jmol – 3D representation of molecules in many formats, for teaching use
• Molekel – Molecule viewing software
• MeshLab – Able to import PDB dataset and build up surfaces from them
• PyMOL – High-quality representations of small molecules and biological macromolecules
• QuteMol – Interactive molecule representations offering an array of innovative OpenGL visual effects
• RasMol – Visualizes biological macromolecules

Nanotechnology

• Ninithi – Visualise and analyse carbon allotropes, such as carbon nanotube, Fullerene, graphene nanoribbons

Plotting

Main category: Free plotting software

• Veusz

Quantum chemistry

See also: List of quantum chemistry and solid-state physics software

• CP2K – Atomistic and molecular simulation of solid-state, liquid, molecular, and biological systems

Screencast

• recordMyDesktop

Screensavers

• BOINC
• Electric Sheep
• XScreenSaver

Simulation software

• List of free and open source simulation software

Statistics

Main category: Free statistical software

• R – Statistics software
• LimeSurvey – Online survey system

Theology

Bible study tools

• Go Bible – A free Bible viewer application for Java mobile phones
• Marcion – Coptic–English/Czech dictionary
• OpenLP – A worship presentation program licensed under the GNU General Public License
• The SWORD Project – The CrossWire Bible Society's free software project

Typesetting

Main category: Free typesetting software

Web conferencing

Main article: Web conferencing

See also: Comparison of web conferencing software

• Jitsi Meet
• OpenMeetings
• Conference XP
• Jami
• BigBlueButton

See also

• Free and open-source software portal

• Open-source software
• Open-source license
• Comparison of file synchronization software § Open-source
• List of HDL simulators § Free and open-source simulators
• List of optimization software § Free and open-source software
• List of concept- and mind-mapping software § Free and open-source
• List of spreadsheet software § Free and open-source software
• Comparison of FTP client software § Free and open-source software
• GNOME Core Applications
• List of GNU packages
• List of KDE applications
• List of formerly proprietary software
• List of Unix commands

General directories

• AlternativeTo
• CodePlex
• Free Software Directory
• Freecode
• Open Hub
• SourceForge

References

1. Richard Stallman (July 13, 2011). "Why Open Source misses the point of Free Software" . Retrieved August 24, 2011.
2. https://www.technologyreview.com/2025/01/24/1110526/china-deepseek-top-ai-despite-sanctions/
3. "Further Development of Verification Check-casesforSix-Degree-of-Freedom Flight Vehicle Simulations" (PDF). NASA Engineering and Safety Center Academy. 2015. Archived (PDF) from the original on March 10, 2021.
4. "Create great flyers, newsletters, brochures and more with open source software". opensource.com.
5. Bärwaldt, Eric (2020). "Collaborative online office solutions". Admin Network & Security. 60/2020. ...users can also convert text files to the ePub format for displaying appear on ebook readers or with desktop software for reading ePub files.
6. "File Formats".
7. Bärwaldt, Eric (2020-09-01). "Working Together Tools for collaborative office work". Linux Magazine (238/2020). For cross-platform use, the suite not only supports the Open Document Format (ODF) but also all newer Microsoft formats, which makes interaction with other office suites easier.

External links

• Open Source Software Directory (OSSD), a collection of FOSS organized by target audience.
• List of open-source programs (LOOP) for Windows, maintained by the Ubuntu Documentation Project.
• The OSSwin Project, a list of free and open-source software for Windows
• Apache Project List
• Apache Projects Directory
• Software - GNU Project - Free Software Foundation
• Free Software Directory