Desktop/Android/HTML5/iOS Java game development framework
Godot is a powerful cross-platform game engine
A simple and easy-to-use library to enjoy videogames programming
Enables Roblox developers to use professional software tools
Real Time Strategy game engine supporting early Westwood classics
Open Source MMORPG Framework
One framework for creating powerful cross-platform games
Gideros Release version
Open source HTML5 game framework that offers WebGL and Canvas
Open game and rendering engine packed into a JavaScript framework
Fast and lightweight JavaScript game engine built on WebGL and glTF
lua dev plugin for unreal engine 4 or 5
A game framework written with osu! in mind.
You can make it - Open Source MMORPG Platform
Open source library for creative expression on the web, desktop, etc.
ThinkPHP Framework
CTFs as you need them
Self-hosted CMS platform based on the Laravel PHP Framework
Arianne is an engine to develop multiplayer online games like Stendhal
A simple cross-platform game engine for creating old-school 2D games
ReShade is a generic post-processing injector for games and videos.
Game engine supporting many 3D/2D formats and graphic effects
An isometric arcade-style game of skill, puzzles and exploration
A complete 2D/3D Arcade Game Engine for Browser (Blender compatible)
TX Library is a tiny graphics library for Win32 written in C++.