Valve has officially released Steam on the Linux platform.

“The introduction of Steam to Ubuntu demonstrates growing demand for open systems from gamers and game developers,”  said David Pitkin, director of consumer applications at Ubuntu maker Canonical. “We expect a growing number of game developers to include Ubuntu among their target platforms.”

Not only that but Valve is commemorating this event with a week-long sale that includes discounts for more than 50 titles available at 50 to 70 percent off. Team Fortress 2 will getting a special limited edition in-game item: Tux, the Linux penguin which can be carried by any class in the game.

Steam Big Picture mode will also be available for Linux users. “With Steam Linux and Big Picture mode, Valve anticipates a growing number of gamers will use Steam in the living room,” said Valve.

“We’re huge fans of Linux. It’s like the indie OS-a perfect home for our indie game,” said Alen Ladavac, CTO of Croteam, the studio that developed the Serious Sam series. “And who better to lead the charge into Linux gaming than Valve? With Steam distribution on Windows, Mac OS, and now Linux, plus the buy-once, play-anywhere promise of Steam Play, our games are available to everyone, regardless what type of computer they’re running. That’s huge.”

Linux users can download Steam from the Ubuntu Software Centre.