You can make it - Open Source MMORPG Platform
TimeBoxing FX: Your productivity at your fingertips 🚀
This is a chess program to help you to organize any chess tournaments
A 3D game engine in java.
Compact/ Chess Interchange Format
Easy YGOPro puzzle editor
AutoTeach makes kids study and learn in exchange for internet access.
Nurikabe, a great game.
Tournaments and Ratings Stack
Adds Web-Based shop for your server.
The next generation mud is an open-source extensible, programmable mud
A cross-platform emulators frontend with ROMs database support.