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
Cross-platform 2D and 3D game engine with modular architecture
The game engine for everyone
Cross-Platform C++ 2D/3D game engine
GemRB is a portable open-source implementation of the Infinity Engine
A JavaScript engine optimized for running React Native
An OpenGL RTS game engine written in C
New Godot bindings for Swift
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
A dead simple 2D game engine for Go
A game engine with an emphasis on real-time cutting-edge solutions
Zig game engine & graphics toolkit
An iOS & tvOS Frontend for Multiple Emulators
Game engine supporting many 3D/2D formats and graphic effects
A complete 3-D game development suite written in Java
An open-source sandbox tower defense game
Open source voxel game engine with support for survival and crafting