Languages made in C#

Does anybody know of any languages written in C# 开发者_开发百科that I can play around with and learn from?

Thank you

P.S. I have searched for them but I couldn't find anything.

I would check out IronRuby, IronPython ... As far as i know these are mostly written in C#...

Edit: I wasn't sure about this so I went and checked. Boo is also written mostly in c# it seems.

Boo is written in C#

Might be worth taking a look the ANTLR parser generator. There's a .NET version, and it can be used to build your own language interpreter or compiler.

The Mono CSharp compiler itself is also written in C#.

I think there are no such languages available.