FlightGear Flight Simulator: free open-source multiplatform flight sim
Pioneer is a open source space adventure game
X-Plane plugin that displays a tablet to aid VR usage
A simulator for drones, cars and more, built on Unreal Engine
FSKneeboard adds a helpful ingame panel to your flight simulator
Solar2D Game Engine main repository (ex Corona SDK)
Cross-platform framework for building truly native mobile apps
An easy-to-use mixed reality library for building VR applications
Maintain logs of model rocket flights and your rocket fleet inventory
A circuit simulator with graphical user interface (GUI)
Plugin based interface program for ETS2/ATS.
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
A free transportation simulator game
Soft-body physics simulator
software for Quickmade flight simulation hardware