kostix

AwaitableUI
Caliburn Micro: WPF, Silverlight, WP7 and WinRT/Metro made easy.
Caliburn: A Client Framework for WPF and Silverlight
CCNetConfig
Chirpy - VS Add In For Handling Js, Css, DotLess, and T4 Files
Chutzpah - A JavaScript Test Runner
CommonServiceLocator
Configuration Section Designer
Cosmos (C# Open Source Managed Operating System)
Cyclops Chat
Dynamic Language Runtime
eXpress Persistent Objects (XPO) Toolkit
Funq: a fast DI container you can understand
Hawkeye - The .Net Runtime Object Editor
IronPython
IronRuby
Javascript .NET
Jint - Javascript Interpreter for .NET
Json.NET
Jurassic - A Javascript Compiler for .NET