scripting languages and SEPPLES

I want to extend some software I'm working on without recompiling it every time by exposing a part of the code with a scripting language.

Lua looks interesting, it looks fairly easy to call C functions in it and I guess it can probably do C++ functionality (classes and templates) too.

any other options?

Roll your own language if your scripting needs are ridiculously simple or you don't care spending time reinventing the wheel, otherwise Lua.