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
FSKneeboard adds a helpful ingame panel to your flight simulator
An open source flight dynamics & control software library
The A32NX & A380X Project are community driven open source projects
A flight software and embedded systems framework
A multiplatform Flight Simulator
A simulator for drones, cars and more, built on Unreal Engine
Simulate chemical processes using advanced thermodynamic models
Virtual Pipe Organ Software
Engine remake of the game "Radix: Beyond the void"
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Air traffic control tower and radar simulator (solo + multi-player)
Physically accurate and validated GPU ray-tracer
Delay-Tolerant Networking suitable for spacecraft and ground
Android, UIQ 3.0, Series 60 Edition 5 open-source software
SimpleLog is a pilot logbook for desktop Windows, Mac and Linux