The game engine for everyone
Cocos simplifies game creation and distribution with Cocos Creator
Xash3D FWGS engine
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Open source library for creative expression on the web, desktop, etc.
Voxel game-creation platform with easy modding and game creation
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Cross-platform game engine in Rust
A dead simple 2D game engine for Go
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Data-Driven Game Engine
2D Game Engine
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
Multi-threaded game engine for Android
online 4X browser game engine
Modern AS3 Game Engine
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
2D physics engine for games
Cross-platform 2D game engine