Below are a few projects that may be of interest.
Akimset API for .NET - Akismet API library for .NET projects written in C#
Domain Reseller - Project designed to allow a small business to spin up their own domain reseller store without being relegated to out-of-the-box solutions with minimal customization/pricing options
IIS Application Pool Monitor - Starting steps for building and developing an app pool monitor service for Windows-based servers running Internet Information Services (IIS)
Simple Plugin System - Simple demonstration of dynamically loading DLLs as useful plugins
SVN Manager - Information about the SVN Manager project for administering a Subversion server running on Windows (open source)
More to come!