Godot is a powerful cross-platform game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Game engine supporting many 3D/2D formats and graphic effects
Open source HTML5 game framework that offers WebGL and Canvas
Desktop/Android/HTML5/iOS Java game development framework
Orx: Portable Game Engine
Real Time Strategy game engine supporting early Westwood classics
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
Open game and rendering engine packed into a JavaScript framework
Open source library for creative expression on the web, desktop, etc.
Gideros Release version
lua dev plugin for unreal engine 4 or 5
Self-hosted CMS platform based on the Laravel PHP Framework
ThinkPHP Framework
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
An isometric arcade-style game of skill, puzzles and exploration
SDL based generic 2D game engine
Arianne is an engine to develop multiplayer online games like Stendhal
Amateur 3D Game Engine
Old-school 2D game engine
Examples of procedural geometry for Unity3D C#
Vivid3D is a C++ IDE/3D engine, with python scripting.
OgreWin3D
INSTEAD - Simple Text Adventure Interpreter.