Endorphin 2.5.2 (and the subsequent 2.7 versions) used a unique approach to animation by simulating a character's nervous system, muscles, and bones.
The technology was famously used in blockbusters like Troy and Poseidon , and video games like Tekken 5 and Grand Theft Auto IV (via its successor engine, Euphoria). Understanding the "Free Download" Status natural motion endorphin 252 free download
Tekken 5 to use NaturalMotion's endorphin - GamesIndustry.biz Endorphin 2