I wouldn't say we're predominantly JVM based. We've also got ReSharper, dotTrace, dotMemory, dotCover and dotPeek, which are all .net based.

But basically, it's because Nitra is an extension and evolution of work done on Nemerle, and Nemerle is a .net language.

Is ReSharper written with C#? I thought I heard it was written with C++.

It's written in C#, with some of the Visual Basic support written in VB. Parts of ReSharper for C++ are written in C++ and C++/CLI.