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Handling Language Interoperability with the Micros, Introducing JScript.NET, Mercury on Microsoft's .NET framework
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Lists of .NET programming languages. Resources.
GotDotNet Resource Center: .Net Language Vendors
A listing of compiler vendors for .NET platform alternative languages.
Nemerle
A hybrid (functional, object-oriented and imperative) programming language for the .NET platform. It is statically typed, has metaprogramming capabilities and is specifically designed for programmers with C#/Java background. [Open source, BSD-like license]