TopMod was developed by a team at the Texas A&M Visualization Laboratory in the early 2000s. It hasn't been updated since 2007. The program is prone to crashing and you'll discover odd behavior as you work through the recipes. There's also very little information available on its use.

What makes this a program worth learning? You'll find that TopMod has an easy methodology for creating basic and complex forms that can be exported for further manipulation in programs such as Meshmixer and SketchUp. The forms you can create with TopMod will take considerably less effort than what can be accomplished in other 3D modeling programs.