Easiest Game Servers to self-host

Containerized Minecraft Java server image

Replaces Minecraft Realms

Gameboy in your browser

Server hosting tool for Minecraft and other multiplayers

Tower-defense and factory game with servers

Replaces Factorio

Open-source reimplementation of Civilization V

Replaces Civilization V

OpenTTD

Game Servers

Open-source transport simulation game with servers

Replaces Transport Tycoon

Open-source tool for telling interactive nonlinear stories

Replaces Inklewriter

Docker image for running Minecraft Bedrock Edition servers

Replaces Minecraft Realms

Free open-source control panel for self-hosted game servers

Replaces AMP, Pterodactyl

Open-source Minecraft launcher for managing instances and modpacks

Replaces Official Minecraft Launcher, CurseForge app

Free space exploration and trading game

Replaces Escape Velocity

Visual novel engine for creating story-based games

Replaces TyranoBuilder

Turn-based fantasy strategy with multiplayer server

Replaces Heroes of Might and Magic

In-game map editor for Minecraft single-player and servers

Replaces commercial map editing tools

Classic-style 2D side-scrolling platform game

Replaces Super Mario Bros

Essential commands and tools plugin for Minecraft servers

Replaces commercial server management plugins

Open-source space adventure and trading simulator

Replaces Elite, Frontier

Free 3D kart racing game with online servers

Replaces Mario Kart

Free city-building simulation game

Replaces SimCity

Self-hosted analytics plugin for Minecraft servers

Replaces Commercial game analytics

Browser-based incremental idle game of civilization evolution

Replaces Cookie Clicker, Universal Paperclips

Open-source city building and management game

Replaces SimCity

Implementation of Terraforming Mars board game

Cooperative platformer based on Teeworlds

Replaces Teeworlds

Turn-based artillery strategy game with servers

Replaces Worms

Free Lemmings-inspired puzzle game with network multiplayer

Replaces Lemmings

Open-source factory-building puzzle game

Replaces Factorio

Open-source interpreter for RPG Maker 2000 and 2003 games

Replaces RPG Maker RTP runtime

Open-source 2D space trading and combat game

Replaces Escape Velocity

Open-source transport and economy simulation game

Replaces Transport Tycoon

Open-source turn-based colonization strategy game

Replaces Sid Meier's Colonization

Open-source multiplayer action and tactics game

Replaces Clonk

Free Quake III-style arena shooter with servers

Replaces Quake III Arena

Lightweight multiplayer first-person shooter

Replaces Counter-Strike

Self-hostable browser version of the 2048 sliding puzzle

Replaces Mobile puzzle games

Open-source dungeon-keeper-style real-time strategy game

Replaces Dungeon Keeper

Retro 2D multiplayer shooter with servers

Replaces Worms, Soldat

Self-hosted block-stacking puzzle game in the browser

Replaces Tetris

Fast-paced real-time strategy game for the Linux terminal

Replaces commercial RTS games

Open-source strategy game of defending Earth from aliens

Replaces XCOM

Fast-paced free arena first-person shooter

Replaces Quake, Unreal Tournament

Sandbox voxel game with multiplayer servers

Replaces Minecraft

Open-source voxel sandbox game for Luanti

Replaces Minecraft

3D Tron-style lightcycle multiplayer game

Replaces Tron

2048 game clone in 3D

2048 variant with Euro coins and notes

2048 game clone

Set of games Framagames from Framasoft

Wordle-based online word game