Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
FlightGear Flight Simulator: free open-source multiplatform flight sim
Ms Dos port with slopes 3d floors true3d demo compatibility fast speed
.NET wrapper for the Irrlicht Engine
Multi-threaded game engine for Android
3D Architecture modelling and physics simulation system
3D Game engine
PixelLight is a cross-platform application framework
Cross-platform 2D game engine
A small Game Engine project.