A server software reimplementation for a certain anime game.

Impostor - An open source reimplementation of the Among Us Server

Fully-functional open-source server implementation for Diablo 3

League Sandbox's Game Server

Private server research project for a certain discontinued mobile game

Web Server (and its launcher) for AoE 1, 2, 3 (all DE), AoE 4 and AoM: RT supporting offline multiplayer and fully cross-platform

Arcaea game private server

A server created in Java designed to revive Habbo Hotel v14 from the 2007 era.

A lightweight desktop client & toolkit for writing, controlling and monitoring color-based automation scripts.

Open-source Monster Hunter Frontier Online server emulator in Go

AzurLane game private server.

Project Lighthouse is a clean-room, open-source custom server for LittleBigPlanet.

A server created in Java designed to revive Habbo Hotel v31 from the 2009 era.

Neonite V2 - An open-source Fortnite lobby emulator, written in JavaScript.

This tool allows you to easily create items, creatures and quests for TrinityCore 3.3.5a.

pancake, fork, lawnmower, spaghetti

Lightweight 2011 RuneScape multiplayer server

A private server implementation for a third impact game sea mainly but should also work for glb and probably cn too

An open-source server implementation for mobile game NieR Reincarnation

A non-exhaustive list of free custom server backend implementations for various games