I am working on a engine/ editor and game wrote in C++, using OpenGL3+. It is called Invaders.
It is an overhead 2D shooter with rpg elements. It has been in dev for several months now. The game is up and running, but plenty more progress to be made. The map engine has lighting, shadows and full map rotation/scaling.
Below are some screenshots, taken at various stages of development.
This is for windows ATM, but since it is wrote in C++ with opengl, porting to other platforms is intended.