Cal3d is the library PS uses for skeletal animations. It is not a modeling program. You model, uvmap, texture, rig, and animate your characters/critters in whichever program you use (max, maya, blender, milkshape, etc.), and then export it to cal3d. This is why I gave links to both the CS and cal3d exporters in the contributing sticky. The CS exporter is for levels/objects while cal3d is for characters.
:emerald: