online-learning-platform-system 
Zen and the Art of Nonprofit Technology
DECEMBER 26, 2008
It has become arguably the most popular open source CMS, and is a very able platform for creating all sorts of great web applications. This is an awesome cross-platform mind mapping tool. Elgg is the open source social network management system. It’s an online note-saving service, with desktop and iPhone clients.
Zen and the Art of Nonprofit Technology
AUGUST 17, 2007
It is totally cross-platform, includes audioconferencing, has chat, etc. The others I assessed include DimDim , Yugma, and Adobe Connect. They are all cross-platform for participants, but none of these can show Linux desktops, and some (like Adobe in particular) can’t even run the presenter software on Linux.
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