CopperCube, the game engine using OpenGL for apps and WebGL for website has just been released in version 5. It now includes terrain support, video playback, network communication, iOS 8 WebGL support, shader programming through scripting, animation blending, and much more. A list of the new features with images is available as well.
OpenCSG is an library for doing image-space rendering of shapes made up by constructive solid geometry (CSG), using and integrating with OpenGL. The new release 1.4.0 contains bug fixes for rendering CSG expressions made up from more than 255 primitives. OpenCSG implements a couple of different algorithms for rendering CSG, and all of them now work correctly for geometry that exceeds this number of primitives.