[PSP - C++] Loading and Navigating a Simple 3D world?

Does anyone know of any open source (preferably C++, but C is ok) games for the Playstation Portable that allow the loading and navigating of simple 3-dimensional worlds? The first thing that comes to mind for me would be LameCraft, but I'm curious to see if there's anything better that I should look into, or maybe a tutorial on it somewhere...

The "Cube" engine? Perhaps someone has ported it to the PSP....

I did a search on it, and it seems it has been ported to the PSP, it just hasn't been released..

Does anyone know of any open source (preferably C++, but C is ok) games for the Playstation Portable that allow the loading and navigating of simple 3-dimensional worlds? The first thing that comes to mind for me would be LameCraft, but I'm curious to see if there's anything better that I should look into, or maybe a tutorial on it somewhere...

QUAKE?

Does anyone know of any open source (preferably C++, but C is ok) games for the Playstation Portable that allow the loading and navigating of simple 3-dimensional worlds? The first thing that comes to mind for me would be LameCraft, but I'm curious to see if there's anything better that I should look into, or maybe a tutorial on it somewhere...

QUAKE?

I think it would be obvious that I'm looking for something other than Quake, being that this is a forum for the Quake series, and we all know that it exists...