ConcourseConnect : A social networking platform

ConcourseConnect is a social networking platform. You can build social networking sites including corporate intranets, business community add-on sites, enthusiast sites, business or product directory sites (like a chamber of commerce or yellow pages), or even stand-alone Web sites. Features include a full range of Web 2.0 tools: ratings, reviews, wiki, blog, comments, discussion forums, an ideas engine, and more. Users begin by creating a rich profile and joining groups. It is perfect for internal collaboration or as a customer feedback forum. The portal framework allows developers to plug in custom portlets and themes.

• Licenses : AGPLv3
• Operating Systems : OS Independent
• Implementation : Java, HTML, AJAX, postgresql

OpenMeetings : Multi-language customizable video-conferencing and collaboration system

OpenMeetings is a multi-language customizable video-conferencing and collaboration system. It supports audio/video and allows you to see the desktop of any participant. It includes a whiteboard, the ability to import a variety of image formats, invitations, a moderation system, backup and language modules, private and public conference rooms, and the ability to record meetings.

• Licenses : LGPL
• Operating Systems : OS Independent
• Implementation : Java, spring, hibernate, MySQL, postgres, Red5, OpenLaszlo

Saros : A Eclipse plugin for collaborative text editing that in particular targets distributed pair programming (also called remote pair programming)

Saros is a Eclipse plugin for collaborative text editing that in particular targets distributed pair programming (also called remote pair programming), but can support arbitrarily many participants at once. All members of a session have an identical copy of an Eclipse project and Saros keeps these copies in sync as editing progresses.

• Licenses : GPLv2
• Operating Systems : Linux, Windows, Mac OS X, any with Java
• Implementation : Java 5, Eclipse, Smack