Mac OS X and Windows OpenGL 3D Engine tools, content and code to create games and applications. Newton physics, OpenAL sound with OGG Vorbis, Lua, Revolution, written in C.
The 'Half Baked Ray Caster' provides 3D rendering mixed with native Flash MovieClip type objects. It supports textures and lighting, and fairly smooth animation on high end PCs. It's written using the free Flex 2 SDK, a C preprocessor and make tools.