F#:

F# is an implementation of the core of the Caml programming language for the .NET Framework, along with cross-language extensions. The aim is to have it work together seamlessly with C#, Visual Basic, SML.NET and other .NET programming languages. In particular it is the first ML language where all the types and values in an ML program can be accessed from some significant languages (e.g. C#) in a predictable and friendly way.