Collaboration
Collaboration Tools :
Collaborative software, also known as groupware, is application software that integrates work on a single project by several concurrent users at separated workstations (see also Computer supported cooperative work). In its modern form, it was pioneered by Lotus Software with the popular Lotus Notes application running in connection with a Lotus Domino server.
From : en.wikipedia.org/wiki/Collaboration_tool
Open-Xchange
The Open-Xchange Collaboration and Integration Server Environment allows you to create, store and link appointments, contacts, tasks, email, bookmarks, documents, forums and many more elements and share them with other users. This environment can be accessed via any modern web browser and multiple fat clients like KDE Kontact, Apples iCAL, Konqueror, Mozilla Calendar, and many more, based on open standards and interfaces.
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