The Modrinth monorepo containing all code which powers Modrinth
Open source HTML5 game framework that offers WebGL and Canvas
CTFs as you need them
Self-hosted CMS platform based on the Laravel PHP Framework
Java/JavaFX/Kotlin Game Library (Engine)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open source library for creative expression on the web, desktop, etc.
3D game engine/framework in C, with Luajit and Python bindings now
Free game engine for development of desktop, mobile, and web games
A retro game engine for Python
A free and open-source Touhou Project fangame
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Programming eXperience Toolkit
Build multiplayer web games played by millions
PoC Minecraft client written in Javascript
Fast and lightweight JavaScript game engine built on WebGL and glTF
The game engine for everyone
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
A completely free, open-source, 2D game engine
An updated version of the classic "Basic Computer Games" book
An elegant Go board and SGF editor for a more civilized age
The Turn Based Strategy Game/eSport. Master your beasts
Cross-platform game engine in Rust
A 2D rigid body physics engine for the web
Full featured MUD server with all the trimmings.