Vroid - A free 3D character modeller
Gombinoscope - Make and mix up faces
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DAZ 3D - Daz 3D, 3D Models, 3D Animation, 3D Software
Abrosoft FaceMixer - FaceMixer is designed to create fantastic face composites with multiple images.
Character Creator 3 - Character Creator 3 is a full character creation solution.