A planetarium software that shows a 3D simulation of the night sky
DIS(IEEE 1278.1) Fully Implemented in C++
A simulator for drones, cars and more, built on Unreal Engine
NextGen Cheat Device
Open-DIS implements the IEEE DIS protocol in multiple languages.
sandbox particle simulator that obeys schrödinger's equation
Free-roaming 3D racing game featuring advanced terrain rendering
OpenEstragon is a market economy simulator.
SuperWikia: The Runtime/Realtime Environment for Codesmiths
X-Plane plugin which controls the Saitek Instrument Panel
... the open-source glide computer