NP1.CMS - Free, Simple, Fast and Safe Content Management System for your Website
This is a fork of the Wacko Wiki with many features and improvements. The main goal of this project was to create a wiki for our needs but now we think this project is interesting for the rest of the world :-)
Crabgrass is social networking, group collaboration, and network organizing Web application. It consists of a solid suite of group collaboration tools such as private wikis, task lists, a file repository, and decision making tools.