Porc is both a graphical front-end for CVS and a Project management tool, and it provides some interesting extra functionality on top of CVS. It was written in C#, for the .NET Framework.
c#.net Mail notification system to combine CVSNT actions and send notification e-mails to subscribed users. Primarily used to combine and mail Commits, Tags, and Watches/Edits on files.
Converter to convert a Visual Source Safe Repository to CVS.