Self-Hosted Apps with 'Multiplayer' feature

PlayCanvas is the world’s easiest to use WebGL Game Engine. It’s free, it’s open source and it’s backed by amazing developer tools.

Tired of the roblox tyranny and greed? The Novetus community game is the solution! Novetus was made to improve on RBXLegacy, with the addition of new features that enhance the launcher for mod development, player customization, and overall usability.

Moddio is a Multiplayer-First Game Engine. It has a built-in server-authoritative netcode, including snapshot interpolation and client-side reconciliation. It can support 50+ concurrent players or 300+ moving entities hosted on a $5/month VM.

Powerful, customizable, cross-platform, opensource table sandbox game.

A collection of simple Lua and Rust games, and an API for playing them including an English dictionary (for word puzzles), websocket multiplayer, state sharing via URL, and auto saving with undo/redo. You can also upload your own Lua games and play in the public web version.

Simply put, Spigot is it. Spigot is the most widely-used modded Minecraft server software in the world. It powers many of the top Minecraft server networks around to ensure they can cope with their huge player base and ensure the satisfaction of their players.

Nakama is an open-source distributed social and realtime server for games and apps. It has a large set of services for users, storage, and realtime communication; as well as specialized APIs like realtime multiplayer, groups/guilds, and chat.

CSM is a multiplayer mod for Cities: Skylines. This mod aims to provide a simple client-server experience where users can play and build together in a single game. Initially, resources such as money, costs demand will be synced between clients.

A simple Agar.io clone built with socket.io and HTML5 Canvas on top of NodeJS.

This is a browser-based multi-player role-playing game you and your friends can enjoy anytime on your own server! The main goal is to expand your empire and complete research activities in order to uncover the history of your species.

Rocketcrab makes it easy for players to discover your game, and easily switch to and from your game without having to manually open a different website and enter a new game code. It accomplishes this by putting your game's page into an iframe, which allows any of your...

Talo is an open source, self-hostable game backend. It's the easiest way to integrate leaderboards, stats, analytics and more into your game.

FreeBoardGames.org is a free and open-source board game platform. We curate high quality boardgame.io implementations of board games and optimize them for delivery so you can quickly reach thousands of players. Enjoy free high-quality games on any device that can access the web.

Javatari is a multiplayer Atari 2600 emulator written in pure Java with no external libs. Just open it! Needs Java 6 or greater and Atari ROMs.

Gnomescroll is a multiplayer survival RPG in surreal environments. Kill demons, raise puppies and collect rocks.

Agones replaces usual bespoke or proprietary cluster management and game server scaling solutions with a Kubernetes cluster that includes the Agones custom Kubernetes Controller and matching Custom Resource Definitions for GameServers, Fleets and more.

RBXLegacy is a multi-version ROBLOX client based on RBXPri scripts that can play LAN and online servers. This also includes support for adding more clients, randomized body colors, and more! This includes the clients by themselves so you do not need to download them separately.

A direct "like for like" replacement for the GameSpy MasterServer, and supports a huge number of games.

The classic pen and paper game Dots and Boxes. Play against a computer or other people. Supports 1 - 4 players and small to large grids. To win try to be the last player to go.

Play Hearts online with friends right through your browser. No registration, nothing to install. Just visit the website and get a url to share with your friends or family so they can join you.

Play the classic board game online or host the game yourself with this open source rendition.

Webtendo brings multiplayer to the web with a JavaScript-based, multiplayer famework for the web.