CELstart uses Python and XML, Crystalspace uses C, and there are bindings for others too if I am not mistaken. (I just use the blender exporter and CELstart right now).
I have no idea about exporting to Sony products, you probably need to by an SDK kit from them.They have a way to do Linux on a PS3, but there are no 3D drivers :(, so I doubt the game engine would work. (unless you somehow got the old Mesa software drivers working somehow)
You can find out much more about CS here in the official forum, I am no expert.
They are down today for some reason, I just reported it to the IRC channel.
If you are doing a 3D shooter I highly recommend CS over blender right now. They have a very complete set up for 3d shooters, called Crystal Core:
It is all open source so you can examine everything they used. They have a real portal system, so with proper planning, you can have amazingly detailed areas all over your world.
I also really enjoy being able to build my shaders in blender material system, with normal maps, texture, and Specular maps. There are a few other nice shaders ready made for you there too.
For outdoor scenes I reccomend CS as well, they have a real terrain system, where you parent your foliage/rock/debris meshes to the terrain, and it scatters them about automatically for you!
YOu can also paint a mask texture for the foliage, so you can specify exactly where to add the meshes, and where to leave bare (for roads , walkways,under buildings, etc)
we can bake nice shadows in blender now with multi UV maps, and the new render baker. It is totaly a manual system though, any changes you make, you need to re-bake everything.
With CS they have it set to automatically UV map, and build the light maps for you, It is a lot like developing in UnrealED for unreal, and Radiant for quake 3 or Hammer for Half Life based games.Only much better!! you get to use blender, and NO BSP!!
Well anyway, CS is really worth looking at for some games.
I am developing my next game in blender game engine first, then I am porting it all over to CS.
I want nice, huge outdoor scenes, with lots of trees, and rocks , and plants.
Here is the guied for the CELstart setup:
here is some python information for CS and CEL start:
Well, hope you have fun with this new toy, I sure have been having a good time with it