Phaser is a free and fast 2D game framework for making HTML5 games
3D game engine/framework in C, with Luajit and Python bindings now
Extremely fast enterprise server framework, can be used in RPC
Drogon: A C++14/17/20 based HTTP web application framework
Phaser CE is a fun, free and fast 2D game framework
JavaScript framework to build game engines, games, emulators and apps
Cerberus Content Management System
A web-based IDE for HTML5 game development. Powered by Phaser
Open-source full-stack web development framework built on top of React
Cross platform SDK
Open-source, cross-platform, game-development tools
A complete web framework to create online Fighting Fantasy adventures
Source code for chinese-dos-games-web
Game engine allows you to create own MMORPG
3D .NET engine for Windows, Linux, Mac
Lightweight framework for old-school RPG GUI in web!
Make robots for MediaWiki-powered sites!
Modular Gaming Open Source Persistent Browser Based Game Framework
Powerful html5 & javascript library for creating applications & games.
Formerly CraveJs, it's for creating JavaScript applications and games.