Gombinoscope - Make and mix up faces
Sketchcop - composite software used by law enforcement
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Morphases.com - Morphases is an online next generation software in face manipulation.
Abrosoft FaceMixer - FaceMixer is designed to create fantastic face composites with multiple images.
Monoface - randomly generate faces using parts from other faces