Gmax

Gmax is a freeware version of 3ds Max with a limited feature set intended for game content creation: modeling, texturing, animating, and basic materials. Although officially discontinued in 2005, 3D content website TurboSquid still maintains a download mirror.

The MAXScript plugins Chimp and Bluestreak (compact versions of scripts) can be used to export JMS files from Gmax.