ManniAT

Barcode Rendering Framework
Caliburn Micro: WPF, Silverlight, WP7 and WinRT/Metro made easy.
EffiProz - A Pure C# Database
Facebook Connect Authentication for ASP.NET
JSON-RPC.NET
OpenNETCF.Barcode Library
Simple HID Library
Sterling NoSQL OODB for .NET 4.0, Silverlight 4 and 5, and Windows Phone 7
Windows Phone 7 Silverlight ZXing Barcode Scanning Library
Windows Phone Power Tools
YAF.NET (aka Yet Another Forum.NET)
ZXing barcode for Windows Phone