All aboard the Steam train – yes, even you, Linux users. The Steam Linux beta is now open to everyone, officially ditching the closed beta that began in early November.
Linux users will need to have Ubuntu 12.04 and the latest version of the Steam client; complete instructions for setting up Steam are on the Ubuntu wiki, with a brief rundown on the Steam community page. Steam has an entire catalog of Linux-supported games, including Team Fortress 2, Amnesia, Killing Floor, Superbrothers: Sword and Sworcery, Trine 2, World of Goo and more.