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Wolfenstein: Enemy Territory
Wolfenstein: Enemy Territory is a 2003 first-person shooter, released as open source in 2010; it is available on Windows and any GNU/Linux distro.
GNU/Linux Installation
You'll probably need 32-bit libraries if you are going to install ET on a 64 bit system. If you are using a Debian-based distro, running "dpkg --add-architecture i386" then "aptitude update" should ready your system. Download the installer from here, and make sure it's executable (chmod +x et-linux*). Run it as root, if you intend to place ET in a location available to all users (the default is /usr/local/games).
ET may also be available through your package manager as "enemy-territory", and this usually works.
If you are using GNU/Linux, you will encounter sound problems unless you are using OSS. Download et-sdl-sound from here (there's a nice one-liner you can run to get it working fast). To use this, you need libSDL 32-bit version, which is available on Debian (after adding i386 arch) as libsdl1.2debian:i386. If you use Pulseaudio, you may have to modify the driver variable that's set in et-sdl-sound. Use et-sdl-sound to launch ET now, but don't replace the actual ET binary with it.
It's probably also a good idea to update ET to the latest version (also the version the /g/ server is using). The update comes in the form of two binaries (et and etded) which you must move to the directory that contains the 2.60 versions of et and etded. You can get it from here
Windows users should not have a problem with sound.
Server
The /g/ server (hosted in the US) is open for testing at IP: 107.170.232.87:27960, version 2.60b. There are no mods running and only original maps, so you don't need to download anything. You can connect from the command line with /path/to/ET +connect 107.170.232.87 This way of connecting also works with et-sdl-sound. Another (sometimes full) server running the NoQuarter mod is dark-alchemy.com