Arianne is an engine to develop multiplayer online games like Stendhal
The first-ever RPG for WordPress
Free strategy browsergame engine.
Modular Gaming Open Source Persistent Browser Based Game Framework
Rock cms, un script php que piensa por si mismo.
CLM for Joomla! 1.5 + 2.5
Moteur de jeux de rôles descripifs (RP) en PHP
Zap Engine
Atlarius is no longer under development.