Sevenate

.NET Extensions Methods Library for C# and VB.NET (ASP.NET, MVC, SL, WPF, EF)
.NET Image Tools
.NET Reflector Add-Ins
A Rich Full Featured WPF/SL MVVM Framework
AgUnit - Silverlight unit testing with ReSharper
Balder - 3D engine for Silverlight
Base Class Libraries
Bindable LINQ
Bitcoin C#
C# Parser
Caliburn Micro: WPF, Silverlight, WP7 and WinRT/Metro made easy.
Caliburn: A Client Framework for WPF and Silverlight
Chronos WPF
Clarius Labs
Coding Guidelines for C# 3.0, C# 4.0 and C# 5.0
Continuous LINQ
Cosmopolitan Theme for WPF
dotNetInstaller: setup bootstrapper for Windows (MOVED TO GITHUB)
Drop Down Style Custom Color Picker in WPF
Elysium