X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.
SteamVR - SteamVR is a suite of technologies created by Valve that power high-fidelity VR experiences.
FlightGear - The FlightGear flight simulator project is an open-source, multi-platform, cooperative flight simulator development project. It also simulates space flight in Earth's orbit. It's flight dynamics engine (JSBSim) is used in a 2015 NASA benchmark.
VorpX - vorpX let’s you play your favorite games on Oculus Rift and HTC Vive in Stereo 3D. Many features are specifically tailored towards VR for the best possible experience on your VR headset.
Digital Combat Simulator - Digital Combat Simulator is a Free-to-play, Single and Multiplayer Combat Flight Simulation developed by Eagle Dynamics and published by The Fighter Collection.
Firefox Reality - Mixed Reality for the Open Web