Construo ver: 0.2.2.1
Author: Ingo Ruhnke
Website: nongnu.org/construo/index.html
Description:
Construo is a programm for constructing wire-frame objects and let them react on physical forces, its neither a real simulation nor a real game, its just a little toy app which can be a nice way to waste time.

Licenses:
GPLv2 - source code