opensource

Git
LimeSurvey.org – The Leading Open Source Survey Tool – Home

This looks like a viable alternative to the paid survey tools. I want to try it out and see if it will work for me.
Elgg: the open source social networking platform

I may be doing a social networking project and this looks extremely handy (if I don’t go with Drupal).
WikiMatrix / Wiki Feature Comparison – Compare them all

This site is SO useful! Just tell it what you’re looking at in a wiki, and it will give you a very thorough comparision of the systems that meet your needs.