Godot is a powerful cross-platform game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Cocos simplifies game creation and distribution with Cocos Creator
The flexible game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Xash3D FWGS engine
Solar2D Game Engine main repository (ex Corona SDK)
JavaScript-based game engine designed to empower developers
The game engine for everyone
Cross-platform 2D and 3D game engine with modular architecture
GemRB is a portable open-source implementation of the Infinity Engine
A JavaScript engine optimized for running React Native
Cross-Platform C++ 2D/3D game engine
New Godot bindings for Swift
An OpenGL RTS game engine written in C
A dead simple 2D game engine for Go
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
A game engine with an emphasis on real-time cutting-edge solutions
Zig game engine & graphics toolkit
An open-source sandbox tower defense game
A complete 3-D game development suite written in Java
Game engine supporting many 3D/2D formats and graphic effects
A certain block game
Open source voxel game engine with support for survival and crafting