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
One framework for creating powerful cross-platform games
Open Source MMORPG Framework
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
A game framework written with osu! in mind.
Self-hosted CMS platform based on the Laravel PHP Framework
You can make it - Open Source MMORPG Platform
Gideros Release version
Open source library for creative expression on the web, desktop, etc.
ThinkPHP Framework
CTFs as you need them
lua dev plugin for unreal engine 4 or 5
Arianne is an engine to develop multiplayer online games like Stendhal
ReShade is a generic post-processing injector for games and videos.
A complete 2D/3D Arcade Game Engine for Browser (Blender compatible)
Game engine supporting many 3D/2D formats and graphic effects
TX Library is a tiny graphics library for Win32 written in C++.
An isometric arcade-style game of skill, puzzles and exploration
INSTEAD - Simple Text Adventure Interpreter.