Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
Cocos simplifies game creation and distribution with Cocos Creator
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Voxel game-creation platform with easy modding and game creation
Free, cross-platform 2D game engine powered by Haxe and OpenFL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A dead simple 2D game engine for Go
Open source library for creative expression on the web, desktop, etc.
Cross-platform game engine in Rust
GemRB is a portable open-source implementation of the Infinity Engine
Game engine to build text adventures.
2D Game Engine
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Modern AS3 Game Engine
2D physics engine for games
Cross-platform 2D game engine