Blender is a free 3D modeling program. It is used for modeling and rendering three-dimensional graphics and animations. Blender is available for GNU/Linux, Mac OS X, and Windows.
A list of the Blender features can be found here : http://www.blender.org/features/
Blender installation :
Blender is present in the official Debian repository:
apt-get install blender
From the Blender website :
As the project is evolving very fast, it could be helpful to download Blender directly from the official website to have access to the latest features.
It's not necessary to install it, you can run it by double clicking on the Blender Icon, or directly with the command line:
cd blender-folder/ ./blender
yafray : an alternative rendering system that can be used with blender
makehuman : a 3-Dimensional humanoid characters modeling software.