Palm3D is a small 3D engine for PalmOS devices I've developed in 2001. Its strength lies in the rendering speed and overall optimization that allows it to run at huge speeds on limited devices: no FPU, few colors, small memory.
I'm only putting up the Sources for download since, due to its direct memory access, the binary would badly crash any modern PalmOS-powered device, while it runs fine on older Palmos v3.5.