Mad Science
action/combat flight sim
Three dimensional first-person space deathmatch!
The simulation of a world and the bugs that live on it
Rigs of Rods Multiplayer server
3D vehicle simulator based on Lagrangian dynamics to simulate dynamics
realistic but simple flight simulator: exploration and casual landing
QRP contests simulator
Modular Minecraft server plugin - commands, events, ...
A revolutionary building creator for Skyscraper.