Events Open Source Server Tomoye 
Tony Karrer
MARCH 3, 2008
There were about 7 examples mentioned including Intuit using a Wiki-like system for customers to ask questions/get advice around taxes, using a group blog with students prior to a formal learning event, the US Army's use of collaboration tools to share best practices in Iraq, and several others. There were a few others.
Joitske Hulsebosch eLearning
NOVEMBER 14, 2009
Often there are good functionality including announcing events, hold discussions and news announce. Examples are Winkwaves , Tomoye , icohere , etc. or open source software like Drupal , Joomla or elgg (moodle is also used, but is actually optimized for Education) What is it? You can invite people to join your group.
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