Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Godot is a powerful cross-platform game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Multi-platform 2D and 3D game engine
The flexible game engine
A game engine with an emphasis on real-time cutting-edge solutions
Xash3D FWGS engine
Cross-Platform C++ 2D/3D game engine
An open source flight dynamics & control software library
Cross-platform 2D and 3D game engine with modular architecture
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Zig game engine & graphics toolkit
An OpenGL RTS game engine written in C
Solar2D Game Engine main repository (ex Corona SDK)
2D JavaScript Physics Engine
A complete 3-D game development suite written in Java
Open source voxel game engine with support for survival and crafting
UCI chess engine
N64 Game-Engine and Editor using libdragon & tiny3d
LayaAir is an open-source 2D/3D engine
GZDoom is a feature centric port for all Doom engine games
The Ren'Py Visual Novel Engine
A game engine powered by python and panda3d