List of Top Free Open Source & Self Hosted Application for Games

Multiplayer game servers and browser games.

0 A.D. – A free, open-source game of ancient warfare. MIT/GPL-2.0/Zlib C++/C
A Dark Room – Minimalist text adventure game for your browser. MPL-2.0 HTML5
EmuLinkerSF – EmuLinkerSF is an open source Kaillera server. Kaillera is a client/server system that any emulator can implement to enable netplay over the Internet. GPL-2.0 Java
Hextris – Fast paced HTML5 puzzle game inspired by Tetris. GPL-3.0 HTML5
Lila – The forever free, adless and open source chess server powering lichess.org, with official iOS and Android client apps. AGPL-3.0 Scala
Mindustry – Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities. GPL-3.0 Java
Minetest – An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. LGPL-2.1/MIT/Zlib C++
MTA:SA ⚠ – Multi Theft Auto (MTA) is a software project that adds network play functionality to Rockstar North’s Grand Theft Auto game series, in which this functionality is not originally found. GPL-3.0 C++
piqueserver – Server for openspades, the first-person shooter in a destructible voxel world. (Clients) GPL-3.0 Python/C++
Posio – Geography multiplayer game. MIT Python
QuakeJS – QuakeJS is a port of ioquake3 to Javascript that can be played in a browser. MIT Nodejs
Quizmaster – A web-app for conducting a quiz, including a page for players to enter their answers. Apache-2.0 Scala
Red Eclipse 2 – A FOSS Arena First-Person Shooter Similar to Unreal Tournament. Zlib/MIT/CC-BY-SA-4.0 C/C++
Teeworlds – Open source 2D retro multiplayer shooter. Zlib C++
The Battle for Wesnoth – The Battle for Wesnoth is an Open Source, turn-based tactical strategy game with a high fantasy theme, featuring both singleplayer and online/hotseat multiplayer combat. GPL-2.0 C++
Veloren – Multiplayer RPG. Open-source game inspired by Cube World, Legend of Zelda, Dwarf Fortress and Minecraft. GPL-3.0 Rust
Word Mastermind – Wordle clone. A Mastermind-like game, but instead of colors you need to guess words. (Demo) MIT Nodejs
Wordle – An Open Source Wordle game. Guess the Wordle in six tries. Each guess must be a valid five-letter word. MIT Nodejs
Zero-K – Open Source on Springrts engine. Zero-K is a traditional real time strategy game with a focus on player creativity through terrain manipulation, physics, and a large roster of unique units – all while being balanced to support competitive play. GPL-2.0 Lua