Godot is a powerful cross-platform game engine
Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cocos simplifies game creation and distribution with Cocos Creator
The flexible game engine
Multi-platform 2D and 3D game engine
Open source voxel game engine with support for survival and crafting
Xash3D FWGS engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cross-platform 2D and 3D game engine with modular architecture
Cross-Platform C++ 2D/3D game engine
Game engine supporting many 3D/2D formats and graphic effects
Native Android app for Habitica
Voxel game-creation platform with easy modding and game creation
A game engine with an emphasis on real-time cutting-edge solutions
An unofficial rules engine for the world's greatest card game
The game engine for everyone
An OpenGL RTS game engine written in C
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
Zig game engine & graphics toolkit
A modern cross-platform low-level graphics library
A JavaScript engine optimized for running React Native
GemRB is a portable open-source implementation of the Infinity Engine
Satisfying monster shooter
Motor de juegos de aventura programable