The only tricky part of getting TNL to work with other languages would be the RPC framework, which does all kinds of macro trickery, inline assembly and worse in order to get clean-looking, high performance RPC out of C++. But then, if you're using TNL from another language, you don't need the C++ RPC functionality - you could implement RPC for that language using the NetEvent code, which is the base for the C++ RPC as well.