From BlenderWiki

Make Human

MakeHuman is completely free, innovative and professional software for the modelling of 3-Dimensional characters. The features that make this software unique are the new Tetra-parametric GUI components and the Natural Pose System, for advanced muscular simulation. Using MakeHuman a photorealistic character can be modeled in less than 2 minutes; MakeHuman is released under an Open Source Licence, and is available for Windows, Mac OS X and Linux.

Referncies

• MakeHuman home page