Open source projects in .NET

It seems that the open source season has arrived to .NET, now they are talking about it everywhere. Of late, I have found individual initiatives as well as companies that mantain several projects, and just yesterday I stumbled on one of the most complete catalogs I've seen of open source projects, exclusively in C#! Me myself, I surrendered to the temptation and got involved in this project, (un)fortunately I've got precious little time that I can dedicate to it but I will try and tell you how the adventure goes.