Arianne is an engine to develop multiplayer online games like Stendhal
JavaScript framework to build game engines, games, emulators and apps
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
3D .NET engine for Windows, Linux, Mac
Create symmetric sprites: browse, save to PC, or store online
c# lua bind with unity3d project for game development
Free strategy browsergame engine.
Modular Gaming Open Source Persistent Browser Based Game Framework
Library for creating turn-based games with simultaneous moves.
Open source network game service
Rock cms, un script php que piensa por si mismo.
Moteur de jeux de rôles descripifs (RP) en PHP
Create your own online real-time browser-based MMO in your website
Zap Engine
Atlarius is no longer under development.