http://www.infoq.com/cn/news/2009/07/23-.NET-Open-Source-Projects
http://bbs.csdn.net/topics/110041681
http://dotnet.dzone.com/articles/t0p-10-open-source-projects
http://www.mono-project.com/Main_Page
http://stackoverflow.com/questions/311759/what-are-the-most-popular-c-sharp-open-source-projects
http://iwebask.com/blog/2011/10/04/14-best-open-source-projects-for-net-developers/