P4.Net is a Perforce API for the Microsoft .Net Common Language Runtime (CLR). It can be used from any managed language including C#, VB.Net, J#, Powershell, IronPython, and MSBuild.
hostingstar.com.au's open source software.
To be used primarily for dotnetnuke modules, a cross platform backup system, .net (dotnet) user controls, 3d plugins and many other bits and pieces.