Valve's collection of Linux-friendly games has grown. On Friday, the developer announced a Left 4 Dead 2 beta for the alternative OS. The beta is available now, and so are authoring tools and dedicated server software.
In addition to bringing L4D2 to Linux, the beta includes a handful of fixes and enhancements. Those tweaks can also be found in fresh beta versions of the game for Windows and Mac clients. The beta shows up as a separate game in the Steam library, so you'll need to download the whole thing to get a taste.
If you prefer puzzle solving to zombie smashing, you might be pleased to know that Portal has made its way to Linux, as well. Linux support comes courtesy of a new beta, which works with Steam's updated content delivery system. The beta is accessible to Windows and OS X users, but not as a separate library item. Instead, you have to right-click on the game, select properties, click the beta tab, and select the SteamPipe beta.