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The following is a list of notable applications which support iCalendar:
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).
Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office suite. Though primarily an email client, Outlook also includes such functions as calendaring, task managing, contact managing, note-taking, journal logging and web browsing.
SOGo is an open source collaborative software (groupware) server with a focus on simplicity and scalability.
Calendaring Extensions to WebDAV, or CalDAV, is an Internet standard allowing a client to access and manage calendar data along with the ability to schedule meetings with users on the same or on remote servers. It lets multiple users in different locations to share, search and synchronize calendar data. It extends the WebDAV specification and uses the iCalendar format for the calendar data. The access protocol is defined by RFC 4791. Extensions to CalDAV for scheduling are standardized as RFC 6638. The protocol is used by many important open-source applications.
The following tables compare general and technical features of notable email client programs.
GroupDAV is a computer protocol used to connect Open Source groupware clients with Open Source groupware servers. Its primary design goal is to be as simple as possible to implement, focusing more on end-user issues with open source applications than on an extremely extensive command set. It is based on a subset of WebDAV.
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.
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.
Calendaring software is software that minimally provides users with an electronic version of a calendar. Additionally, the software may provide an appointment book, address book, and/or contact list. These tools are an extension of many of the features provided by time management software such as desk accessory packages and computer office automation systems. Calendaring is a standard feature of many PDAs, EDAs and smartphones and also of many office suites for personal computers.
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.
Sun Java System Communications Suite is a collection of "Industrial-Strength" software services from Sun Microsystems. The supported platforms are: Red Hat Enterprise Linux, Solaris and Windows Server. Since Oracle acquired Sun in 2010, collection is now called Oracle Communications Unified Communications Suite.
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.
O3Spaces is a document management system developed by O3Spaces B.V.. It is built by a team of software engineers based in the Netherlands using OpenOffice.org, StarOffice, and ODF-centric applications as enterprise office and collaboration solutions. The product is written in Java, and based on the Tomcat server with a PostgreSQL backend. O3Spaces works by providing users a single web-based team environment, with built-in search capabilities and an optional Desktop Assistant. Its search functionality is said to work across PDF, ODF, and Microsoft Office document formats. Currently Firefox, Internet Explorer and Safari are supported.
GMS (GMS) is a commercial mail and groupware server developed by Gordano Ltd. It runs on Windows, Linux, Solaris, and AIX. Originally called NTMail which was the first commercially available mail for the Windows platform, the products were rebranded to the Gordano Messaging Suite in August 2002 to reflect the support for additional hardware platforms and operating systems.
vCard Extensions to WebDAV (CardDAV) is an address book client/server protocol designed to allow users to access and share contact data on a server.
sabre/dav is an open source WebDAV server, developed by fruux and built in PHP. It is an implementation of the WebDAV protocol, providing a native PHP server implementation which operates on Apache 2 and Nginx web servers.
MailSite is a commercial mail server, calendar software, contact manager and collaborative software developed by Rockliffe Systems. MailSite was one of the first mail servers to run on Windows NT using Internet standards when version 1.2 was released in 1996. MailSite has been in continual development since 1996 with version 10 released in 2013. MailSite runs on a single Windows Server or a cluster of Windows Server computers. MailSite works natively with Microsoft Outlook versions 2007 to 2013 for mail, calendar and contacts without requiring any Outlook plug-ins. MailSite includes an Exchange ActiveSync (EAS) server for synchronizing mail, calendar and contacts with mobile devices. MailSite also works with Internet Standards-based mail clients such as Mozilla Thunderbird.
Zentyal is an open source email and groupware solution based on Ubuntu Linux.
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 the 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.