Godot is a powerful cross-platform game engine
Xash3D FWGS engine
Open source voxel game engine with support for survival and crafting
The game engine for everyone
Cocos simplifies game creation and distribution with Cocos Creator
Voxel game-creation platform with easy modding and game creation
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)
Open source library for creative expression on the web, desktop, etc.
New Godot bindings for Swift
Cross-platform game engine in Rust
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: Portable 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
Android OpenGL Game Engine
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons