Download at: http://www.sauerbraten.org
Fun, addictive singleplayer/multiplayer game, similar to AoS in some aspects.
Gameplay similar to Quake 3 or Reflex (from the videos I’ve seen about Reflex)
Also has a community, much like aloha.pk (http://www.sauerworld.org)
Yes, and did I say it was free and open-source?
Also, it runs very smooth on nearly all configurations
http://www.codeotaku.com/journal/2010-12/free-games/sauerbraten/_cache/RegenCapture.large.png
Thanks,
- 3lb01k