C++ wrapper and extension of OpenGL. Provides Scene Graphing natively and cross-platform development through "glue" libraries. "glues" available so far; Qt, X11, GLUT, SDL, Allegro (with AllegGL ), with Win32 to come. Base library depends on OpenGL only.
Milk Engine is a flexible engine suitable for almost any game. Milk Engine will contain everything needed to develop a game, even for the newbie. Yet its very useful for advanced users. Its based on OpenGL and SDL, therefore its also cross-platform.
SLUT (Sleak graphics Library Utility Toolkit), is an optimized and minimized alternative to GLUT (Graphics Library Utility Toolkit).