HCL Notes is a proprietary collaborative software platform for Unix (AIX), IBM i, Windows, Linux, and macOS, sold by HCLTech. The client application is called Notes while the server component is branded HCL Domino.
GNOME Evolution is the official personal information manager for GNOME. It has been an official part of GNOME since Evolution 2.0 was included with the GNOME 2.8 release in September 2004. It combines e-mail, address book, calendar, task list and note-taking features. Its user interface and functionality is similar to Microsoft Outlook. Evolution is free software licensed under the terms of the GNU Lesser General Public License (LGPL).
SOGo is an open source collaborative software (groupware) server with a focus on simplicity and scalability.
Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email. It offers a number of inter-changeable graphical UIs all built on top of a common core.
Kolab is a free and open source groupware suite. It consists of the Kolab server and a wide variety of Kolab clients, including KDE PIM-Suite Kontact, Roundcube web frontend, Mozilla Thunderbird and Mozilla Lightning with SyncKolab extension and Microsoft Outlook with proprietary Kolab-Connector PlugIns.
Scalix is an e-mail and groupware server that runs on Linux, licensed under the Scalix Public License (SPL).
Zimbra Collaboration, formerly known as the Zimbra Collaboration Suite (ZCS) before 2019, is a collaborative software suite that includes an email server and a web client.
Group-Office is a PHP based dual license commercial/open source groupware and CRM and DMS product developed by the Dutch company Intermesh. The open source version, Group-Office Community, is licensed under the AGPL, and is available via GitHub. GroupOffice Professional is a commercial product and offers additional business modules like project management, finance, HR and time tracking.
Bynari is a defunct company based in Dallas, developing server and email software, mainly known for its Insight Family, similar to Microsoft Exchange Server with Outlook.
Axigen is a Linux, Windows, and Docker mail server with groupware and collaboration functionalities. It supports SMTP, IMAP, POP3, and webmail services, and includes features such as an integrated mailing list server, Antivirus and Antispam integration options, and various mobile capabilities including mobile-friendly webmail and Exchange ActiveSync support. Axigen can be hosted in data centers, on bare-metal or Private or Public Clouds of choice.
Zarafa was an open-source groupware application that originated in the city of Delft in the Netherlands. The company that developed Zarafa, previously known as Connectux, is also called Zarafa. The Zarafa groupware provided email storage on the server side and offered its own Ajax-based mail client called WebAccess and a HTML5-based, WebApp. Advanced features were available in commercially supported versions. Zarafa has been superseded by Kopano.
Ipswitch IMail Server is an email server application with groupware functionality that runs on Microsoft Windows OS. It was developed in 1994 by Ipswitch, Inc., a software company based in Lexington, Massachusetts.
OnlyOffice, stylized as ONLYOFFICE, is a free software office suite and ecosystem of collaborative applications. It consists of online editors for text documents, spreadsheets, presentations, forms and PDFs, and the room-based collaborative platform.
GroupWise is a messaging and collaboration platform from OpenText that supports email, calendaring, personal information management, instant messaging, and document management. The GroupWise platform consists of desktop client software, which is available for Windows,, and the server software, which is supported on Windows Server and Linux.
IceWarp, Inc. is a software company located in Prague, Czech Republic. It develops IceWarp Mail Server, an email, messaging and collaboration service for small, medium and enterprise level businesses. IceWarp has offices in the United States, Germany, Russia, the Czech Republic and India. The company has been in business since 1998 and is used by over 50,000 businesses around the world. Its product is an alternative to Exchange Server, Office 365 or G Suite.
Kolab Now is a web-based email and groupware service, based completely on free and open-source software. It is owned and operated by Kolab Systems AG and was formerly known as MyKolab.
Zentyal is a open source email and groupware solution based on Ubuntu Linux. The latest release took place on February 26, 2024.
MailEnable is a Windows-based, commercial email server distributed by MailEnable Pty. Ltd, an Australian-based software company which was established in 2002.
Kopano is an open-source groupware application suite originally based on Zarafa. The initial version of Kopano Core (KC) was forked from the then-current release of Zarafa Collaboration Platform, and superseded ZCP in terms of lineage as ZCP switched to maintenance mode with patches flowing from KC. Kopano WebApp similarly descended from Zarafa WebApp. Since October 2017, Kopano Core is also known more specifically as Kopano Groupware Core, since Kopano B.V. developed more products that were not directly requiring groupware components.
