A game framework written with osu! in mind.
Universal Aim Assist Framework
Desktop/Android/HTML5/iOS Java game development framework
A framework to build Pokémon RPG games
One framework for creating powerful cross-platform games
Open source HTML5 game framework that offers WebGL and Canvas
Open Source MMORPG Framework
A simple and easy-to-use library to enjoy videogames programming
Pokémon Save File Editor
3D game engine/framework in C, with Luajit and Python bindings now
Netcode that provides networking capabilities to GameObject workflows
Homebrew development library for Nintendo 3DS/Horizon OS user mode
Kotlin extensions for the libGDX game framework
Svelto ECS C# Entity Component System
Multi-platform 2D and 3D game engine
Flexible level editor
A modular Common Lisp game engine
Godot game template and component-based framework
Open source Old School RuneScape client
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Open game and rendering engine packed into a JavaScript framework
A lightweight game server framework implemented with Actor Model
A game engine powered by python and panda3d
Python MUD/MUX/MUSH/MU* development system
Unity3D Client And C# Server Framework