Opengate is a Jumpgate remake
3D space trading and combat game
robotfindskitten: a Zen simulation
The Clue! / Der Clou!
Open source model airplane simulator
A planetarium software that shows a 3D simulation of the night sky
Open-DIS implements the IEEE DIS protocol in multiple languages.
Tools using the s3pi library and other related works
Sims 3 (and other) game package library
Supports NxT, Asuro, Arduino-Bot and many more. With simulator.