Blender - 3D content creation suite [Freeware]

[Stepherd]

Blender is a free and open-source 3D computer graphics software product used for creating animated films, visual effects, interactive 3D applications or video games. Blender's features include 3D modeling, UV unwrapping, texturing, rigging and skinning, fluid and smoke simulation, particle simulation, animating, match moving, camera tracking, rendering, video editing and compositing. It also features a built-in game engine.

Requirements:

Operating Systems:
Windows XP, Vista or 7
Mac OS X 10.5 and later
Linux
FreeBSD
Minimal specs for Hardware

Minimal specs for Hardware:
1 GHZ Single Core CPU
512 MB RAM
1024 x 768 px Display with 16 bit color
3 Button Mouse
Open GL Graphics Card with 64 MB RAM
Good specs for Hardware

Good specs for Hardware:
2 GHZ Quad Core CPU
4 GB RAM
Full HD Display with 24 bit color
3 Button Mouse
Open GL Graphics Card with 1 GB RAM
Production specs for Hardware

Production specs for Hardware:
Multi Core CPU
8-16 GB RAM
Two times Full HD Display with 24 bit color
3 Button Mouse + tablet
Open GL Graphics Card with 2 GB RAM, Nvidia GTX or Quadro, or AMD FireGL

http://www.blender.org/