Gombinoscope - Make and mix up faces
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sketchcop - composite software used by law enforcement
Abrosoft FaceMixer - FaceMixer is designed to create fantastic face composites with multiple images.
Morphases.com - Morphases is an online next generation software in face manipulation.
Face Gen - The easy way to create realistic faces 3D human faces from 1 or 2 photographs or at random.