A certain block game
Free and open source real-time strategy game
Fully-functional open-source server implementation for Diablo 3
Source code repository of the FreeOrion project
Telegram Bot API for Java
Minecraft map editor and mod
Open-source Android/Desktop remake of Civ V
A bridge/proxy allowing you to connect to Minecraft
Magic Another Game Engine
An unofficial rules engine for the world's greatest card game
Fully async, multithreaded, predictive, open source, 3.01 reach
Empowering everyone to host fast and efficient Minecraft servers
A high performance and high compatibility 1.12.2/1.16.5/1.18.2 version
1.21.11 Lightweight Minecraft server
Wrapper of syncthing for Android
A permissions plugin for Minecraft servers
Apache IoTDB
Download Minecraft worlds, extend server's render distance. 1.12.2
Odamex is a free, cross-platform, modern client-server Doom engine
Cooperative multiplayer graphical RPG and adventure game
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Arianne is an engine to develop multiplayer online games like Stendhal
TKD Scoring Wi-Fi Server supporting Android and IPhone clients