Library: Oolong Engine at Under The Bridge

Here’s an open source 3D library that we haven’t mentioned before: the Oolong Game Engine. It appears to take notable advantage of the PowerVR SDK, and provides a comprehensive feature list:

OpenGL ES 1.1 support

Math library that supports floating-point calculations with an interface very similar to the D3D math library

Support for numerous texture formats including the PowerVR 2-bit, 4-bit and normal map compression formats

Support for PowerVR’s POD (Scene and Meshes) and the 3DS files formats

Touch screen support

Accelerometer support

Text rendering to support a basic UI

Timing: several functions that can replace rdstc, QueryPerformance etc.

Profiler: industry proven in-game profiler

Resources streaming system

Bullet SDK support (for 3D Physics)

Audio engine with OpenAL support

Networking with the ENet library

Industry proven memory manager from http://www.fluidstudios.com

Code is up at Google Code and under the permissive MIT license, so that should definitely be on your short list of options to check out for your next 3D iPhone game!