A game framework written with osu! in mind.
Godot is a powerful cross-platform game engine
Open Source MMORPG Framework
A simple and easy-to-use library to enjoy videogames programming
Open source library for N64 development
Enables Roblox developers to use professional software tools
Open game and rendering engine packed into a JavaScript framework
Desktop/Android/HTML5/iOS Java game development framework
One framework for creating powerful cross-platform games
Fast and lightweight JavaScript game engine built on WebGL and glTF
Real Time Strategy game engine supporting early Westwood classics
Open source HTML5 game framework that offers WebGL and Canvas
ThinkPHP Framework
Gideros Release version
lua dev plugin for unreal engine 4 or 5
You can make it - Open Source MMORPG Platform
Open source library for creative expression on the web, desktop, etc.
CTFs as you need them
Self-hosted CMS platform based on the Laravel PHP Framework
Game engine supporting many 3D/2D formats and graphic effects
TX Library is a tiny graphics library for Win32 written in C++.
Arianne is an engine to develop multiplayer online games like Stendhal
SDL based generic 2D game engine
INSTEAD - Simple Text Adventure Interpreter.
Old-school 2D game engine