FreeGameDev

This program maybe of interest for 3D art game designers:

Application: Makehuman
Use: create 3D meshes of human figures
License: AGPL 3.0 (license of the output CC0 )
Dependencies: python language

Well known

But as you rarely need various naked people in games, and their clothes support isn't very good, nor very suitable for in-game use (last time I checked), I see little application for this. The only idea I had before was using the faces on another model to allow for some variety.