The Cube 2 Sauerbraten team have just released their latest version, dubbed "Justice Edition". eihrul has this to say on the Cube Forums:
http://cubeengine.com/files.php430 new maps, Inky and Captain Cannon player models, hold and efficiency game modes, vslots for editing texture properties in-game, alpha material for making transparent geometry, multi-threaded calclight, radar mini-map, and more stuff...
See changelog for more info:
So, what are you waiting around here reading this for? Go download it already!
[Source: cubeengine.com]
NOTE: This is not the place to get technical support and/or report bugs, please visit cubeengine.com for help with Cube 2: Sauerbraten.
I've got big plans for the {m00c0w} clan (or {m00} for short). Thanks to my friend Snuggles, we have a server up and running (Look for "{m00} moocowclan.net" in the MSL). Coop-Edit is always our top pick, though all players and game modes are welcome for now.
The feature-rich site will have clan news, current project information, a blog, server status information, a forum, a screenshot gallery, and much more. You don't have to be a member of {m00} to visit, but accepted {m00} members will get special bonuses, such as the ability to schedule coop-edit sessions with friends and collaborate on maps and projects.
Right now, I'm working diligently to get the site started as soon as possible but it's a lot of work. If you'd like to offer any coding/testing/designing help, let me know. ANY questions, suggestions, help, ideas, or criticisms are welcome.
:3
After lot's and lot's of work the wait is finally over - AssaultCube has hit a milestone release with it's version 1.0.

The results are in! Congratulations to the winner marcpullen, your map was excellent, as were many others, which were considered great additions to Sauerbraten Assassin Edition!
Because of the lack of people entering these things, the rules are going to be fudged a bit. Anyone can enter, because the winner will be judged by popularity (rating). ANY mod/gamemode can be used for your submission. This competition ends when Quadropolis time hits 7th January 2008.
To mark your map as a competition entry, select it from the "Release Status" drop down box when you create or update your node. Remember: One map entry per person!
Remember to have fun, and be sure to vote for your favorite maps!

The game is freeware but not open-source;
downloads available for Windows and Mac OS X ... but (sadly) not for linux (yet???).
Quoting Marble-Arena.com:
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Zap your way to the top in this exciting new game. Control your marble around easy to intricate levels, up and down slippery slopes, mastering physics contraptions such as jumppads, air vents and vortexes.
After the hit success of their last event, the Woop Clan are holding another one of their infamous Frag Fests starting Saturday, the 20th of October.

The Woop Clan holds frag fests every two to three months, with a variety of input from the Sauerbraten and AssaultCube communities. Woop Clan member Drakas was kind enough to answer a few questions regarding this fantastic event, read on for more.
The last (August) Mapping competition turned out to be a bust, and I'll admit this is partly my fault for screwing up the last one so badly, but also due to the fact that it is so difficult to follow and enter.
Due to the poor turnout, only one map was officially submitted in time, which wins by default. I will be endeavouring to automating the competition process somewhat during a redesign of some of the systems here on Quadropolis (you may have already noticed some of these improvements), utilising the rating system. Suggestions and comments on this are more than welcome.