NET/Mono 2.0 Component for creating client side proxy connections to SOCKS v4, SOCKS v4a, SOCKS v5, and HTTP proxy servers. Returns a System TcpClient object once the proxy connection is established. Async calls supported. Examples in C# and VB.NET.
The Tao Framework for .NET is a collection of bindings to facilitate cross-platform media application development utilizing the .NET and Mono platforms. Lots of library wrappers: OpenGl FreeGlut OpenAl Cg Lua Sdl PhysFs Glfw FFmpeg FreeType ... etc
Xamarin.Mobile is a library that runs on iPhone, Android and Windows Phone 7 which abstracts the underlying functionality and exposes a common API that developers can build against.
ServiceStack JsonSerializer is based on JSV (the fastest text serializer for .NET), and is over 3.6x times faster than the BCL
JsonDataContractSerializer and is around 3x faster than NewtonSoft JSON.NET (the previous fastest JSON serializer benchmarked).