Host your own lobbies and dedicated servers, and mod it
Twine, a tool for telling interactive, nonlinear stories
The Ren'Py Visual Novel Engine
A cross-platform IO layer for an interactive fiction player
Launcher for Flashpoint Archive
A modular Common Lisp game engine
A quick and easy to use drag and drop retro game creator
Fast and lightweight JavaScript game engine built on WebGL and glTF
Eva.js is a front-end game engine for creating interactive projects
BlueJ and Greenfoot
IsoCity: City building simulation game
PhantomBot is an actively developed open source interactive Twitch bot
The HTML5 Creation Engine
Programming eXperience Toolkit
Open source library for creative expression on the web, desktop, etc.
Self hosted, you-owned Grok Companion
Simple DirectMedia Layer
nvim plugin designed to make you better at Vim Movements
Educational game development environment designed to teach programming
Box3D is a 3D physics engine for games
Box2D is a 2D physics engine for games
Fantasy computer for making, playing and sharing tiny games
The purpose of Emupedia is to serve as a nonprofit meta-resource
s&box is a modern game engine, built on Valve's Source 2
Educational computer programming environment using Haskell