Spring RTS Engine

Dose this engine work with C++? Or am i going to have to learn the Lua languish?

It's written in C++, but Lua is used to run customized code on it.
You could always write C++ code and compile it all yourself though...

The engine is written in C++. It has an API (which is used by nearly all mods) that allows lua callins/outs and opengl.

Don't worry about lua if you are already good with C++ - it's dead easy, if somewhat idiosyncratic.