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 game and rendering engine packed into a JavaScript framework
Fast and lightweight JavaScript game engine built on WebGL and glTF
One framework for creating powerful cross-platform games
Open Source MMORPG Framework
Desktop/Android/HTML5/iOS Java game development framework
Open source HTML5 game framework that offers WebGL and Canvas
A quick and easy to use drag and drop retro game creator
Twine, a tool for telling interactive, nonlinear stories
Open source library for N64 development
You can make it - Open Source MMORPG Platform
Fantasy computer for making, playing and sharing tiny games
A game framework written with osu! in mind.
ThinkPHP Framework
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
Gideros Release version
CTFs as you need them
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
TX Library is a tiny graphics library for Win32 written in C++.
Game/Scene Development System