Ember

Ember is a 3d client using the OGRE 3d library. It's available for all modern Linux distributions, FreeBSD, OSX and MS Windows.
More information can be found at it's main wiki site.

Ember is being developed by Erik Ogenvik. You can find the developers at irc.worldforge.org, channel #ember.

Current release

The current release of Ember is 0.7.1. It was released 2013-10-25. The files are hosted by sourceforge:

You can also use WebEmber to play within your browser.

For more information, see the wiki site.