You can make it - Open Source MMORPG Platform
A fresh & lightweight javascript game engine
Retro-Gaming Multi-Emulator Frontend. Frontend-of-Frontends
0 A.D. is a free, open-source, cross-platform real-time strategy game.
The imaginary eight-bit machine
JAVA websocket implementation for a bomberman-like game
Modular Gaming Open Source Persistent Browser Based Game Framework
An extensible development framework for roleplay games.