Orc is a embedded language for orchestrating concurrent and distributed programming. It can ensure safe, dead-lock free concurrent execution. This is an implementation of Orc semantics for the .NETframework.
Ocean Scheme is an implementation of the Scheme programming language (aiming to be compatible with the upcoming R6RS Standard), whose native platform is the .NETframework (Mono, MS, and DotGNU). Written ground-up in C#.
ACDK - Artefaktur Component Development Kit - is a platform independent C++-framework similar to Java or C#/.NET for generating distributed and scriptable components and applications.