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Godot Engine – Multi-platform 2D and 3D game engine

Babylon.js is a powerful, beautiful, simple, and open game and rendering engine packed into a friendly JavaScript framework.

Desktop/Android/HTML5/iOS Java game development framework

🎮 Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

A lightweight and modular front-end framework for developing fast and powerful web interfaces

lightweight, powerful javascript datetimepicker with no dependencies

A JavaScript Typing Animation Library

📚 Community guides for open source creators

a modern & lightweight HTML5 game engine

CSS custom properties to help accelerate adaptive and consistent design.

Turbulenz is a modular 3D and 2D game framework for making HTML5 powered games for browsers, desktops and mobile devices.

A simple and easy-to-use immediate-mode gui library

Style tools for UI components

Twine, a tool for telling interactive, nonlinear stories

Open-source clone of the original X-Com 👽

A completely free, open-source, 2D game engine built on proven torque technology.

A boilerplate for creating your own custom style guide

Overlap2D Game development toolkit for UI and Level design

Opensource rebuild of the XCOM Apocalypse Engine that requires the original files to run.

PolyGlot is a conlang construction toolkit.

Notebook.ai is a set of tools for writers, game designers, and roleplayers to create magnificent universes – and everything within them.

Procedural world map generator

Worldbuilding and RPG campaign management tool

Automatically generate Windows and macOS versions of your Twine games, for free!

SugarCube is a free (gratis and libre) story format for Twine/Twee.

Combo of addons + template to create visual novels in Godot inspired by Ren'Py

A Twine 2 story format that provides JSON export

A JSON formatted list of all the spells from the 5e SRD

Twine Cookbook