Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Voxel game-creation platform with easy modding and game creation
Cocos simplifies game creation and distribution with Cocos Creator
The game engine for everyone
Open source voxel game engine with support for survival and crafting
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Multi-platform 2D and 3D game engine
A dead simple 2D game engine for Go
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Cross-platform game engine in Rust
Open source library for creative expression on the web, desktop, etc.
New Godot bindings for Swift
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
GemRB is a portable open-source implementation of the Infinity Engine
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
Orx: Data-Driven Game Engine
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Game engine to build text adventures.
Urho3D Game engine
Open source reimplementation of GTA San Andreas game engine in Unity
2D Game Engine
Cross-platform 2D and 3D game engine
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons