mialib is a core library for game development and interactive graphics research, this has utility modules and defines a framework for developing graphical applications like games.
GLUI is a GLUT-based C++ user interface library which provides controls such as buttons, checkboxes, radio buttons, and spinners to OpenGL applications. It is window-system independent, using GLUT or FreeGLUT.
A 64-bit clean (hopefully!), portable, object oriented library of tightly integrated low-level classes, templates and functions targetting realtime multithreaded applications such as midi sequencers, audio synthesisers, games and simulations.