YES. This game. I did a quick search on this, and I've only found mentions of it. Not a full blown topic. I've been playing Cube for awhile, and it's been awhile since I played it. I decided to use my dedicated server for Sauerbraten (as well as Blockland) for a 24/7 TDM server. But I shall explain the game.
What is the Cube engine?
Cube 2: Sauerbraten (German for "sour roast", also known as Sauer) is a cross-platform, Quake-like first-person shooter that runs on Microsoft Windows, Linux, FreeBSD and Mac OS X using OpenGL and SDL. The game features single-player and multiplayer gameplay and contains an in-game level editor, its main feature. The game engine is free and open source software, under the zlib License,[2] with commercial support available from the developer's own business counterpart, Dot3 Labs.[3] The game media is released under various non-free licenses. The aim of the project is not to produce the most features and highest-quality graphics possible, but rather to allow map-editing to be done in real-time within the game, while keeping the engine source code small and elegant.
The game started as a redesign of the original Cube game engine[4][5], and its first, developer-only, release was made on February 27, 2004[6]. The latest release, dubbed the "Justice Edition", debuted on July 19, 2010[7], adding two new player models, thirty new user-created maps, several new game modes, including Efficiency CTF, Efficiency Hold, Efficiency Protect, Hold, and InstaHold; a mini-map, clock, and crosshairs, among various other things.
In my words: This is like a free, fast paced, Quake clone. It has amazing graphics, and it can run on the crappiest hardware and still look good.
I owned a Dell which ran a Pentium 3 @650 mhz, and it had a Geforce FX 5200. It ran perfectly on high graphics.
Cool, is it free?
>open-source
>has to be free (OTHER THAN REDHAT.)
Yeah, it is. It's also really tiny. Well. 450MBs if it's tiny to you.
Downloads
http://cubeengine.com/files.php4Pick your OS there.
Screenshots



Tom's server
It's listed at "TomTheGeek's 24/7 TDM" but if you can't find it:
Go to a random server, and press "~". Then do "connect tomthegeek.no-ip.org"
Discuss.