Kingsway - A retro RPG built into an operating system
X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.
Quest of Dungeons - Quest of Dungeons is a Brilliant, Role-playing, Action-Adventure, Turn-based, 2D, and Rough-like and Single-player video game developed and published by David Amador.
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.
SanctuaryRPG - A humorous and strategic turn-based ASCII dungeon crawler.
Tom Clancy’s H.A.W.X 2 - Tom Clancy’s H.