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.
I'm using this to make an Open Source game from scratch. By now it's only me, so it will take some time, but I'll keep you posted. The idea is to make a 3D plattform game using OpenGL, SDL and C++, and then extend it to use OpenAL.