The flexible game engine
Godot is a powerful cross-platform game engine
Solar2D Game Engine main repository (ex Corona SDK)
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cocos simplifies game creation and distribution with Cocos Creator
JavaScript-based game engine designed to empower developers
Cross-platform 2D and 3D game engine with modular architecture
Multi-platform 2D and 3D game engine
An OpenGL RTS game engine written in C
A game engine with an emphasis on real-time cutting-edge solutions
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cross-Platform C++ 2D/3D game engine
Xash3D FWGS engine
Zig game engine & graphics toolkit
Game engine to build text adventures.
A complete 3-D game development suite written in Java
Game engine supporting many 3D/2D formats and graphic effects
Open source voxel game engine with support for survival and crafting
Multi Theft Auto is a game engine
A game engine powered by python and panda3d
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Recreation of the classic Grand Theft Auto III game executable
LayaAir is an open-source 2D/3D engine
Cross-platform 2D game engine focused on ultimate productivity
GemRB is a portable open-source implementation of the Infinity Engine