Marauroa is a Multiplayer Online Engine Server, which you can use to build your own online games using Marauroa as a Content Management system.
Marauroa 3.9.2 introduces a better algorithm to store hashed passwords (it can be disabled with password_hash=md5 in the configuration file server.ini for compatibility). It fixes an issue that prevented clients from caching transferable content. Finally, it works around a bug in OpenJDK webstart which prevents clients from connecting to a server if a http proxy, without a socks proxy, is configured in Firefox.
More info at http://arianne.sourceforge.net/engine/marauroa.html