a real-time terrain rendering system supports asynchronous paging, dynamic terrain, and much more. It compiles under Irix, Linux, MacOS X and Windows (VC++ and cygwin).
includes sound effects, music, a complete 3D engine, font rendering, a simple Windowing library, a game scripting language, a GUI, networking, 3D math library and a collection of handy utility functions.
a free application framework designed for "creative coding". OpenFrameworks is written in C++ and runs on Windows, Mac OS X, and Linux. It is developed and maintained by Zachary Lieberman and Theo Watson.