Blender lets you do anything and everything including,
- UV Unwrapping
- Physics and Particles
- Imaging and Compositing
- Realtime 3D / Game Creation
and lot more.
You can view or download it at Tutsplus.com.
Compared to expensive tools such as 3DS Max, or Maya, Blender gives a huge advantage not only in terms of cost, but an amazingly productive interafce which is very intiutive once past the learning curve.