The majority of the work shown here has been done with Blender, “the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.” (external link) I

Realtime:

Doppelganger is a game demo exploring the implications of player/avatar interaction. The player is able to spawn multiple characters that all respond to the same player controls, resulting in different trajectories. A windows executable is available for download here.

Renders: