FlightGear Flight Simulator: free open-source multiplatform flight sim
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
Opengate is a Jumpgate remake
War of seventh kings
A planetarium software that shows a 3D simulation of the night sky
3D urban environment renderer : browser-app ; as well as a GTA clone
Physics Game like "The Incredible Machine"
Mad Science
The free and Open Source hockey simulator
Realistic space (Solar System) mission planner
SuperWikia: The Runtime/Realtime Environment for Codesmiths
Bringing Plato's Symposium to VR
A new version of the Shuttle PB with new meshes and other features ...
A open-source online football manager like hattrick
Tool for Wide Area Measurement System
An editor for .key files for Falcon BMS 4.32
Light of Nova : Battle Simulator
Qt/Linux based software to control model railways