When you're talking Linux, three big names always pop up: Canonical's Ubuntu, Novell's openSUSE and Red Hat's Fedora. Ubuntu has ridden a groundswell of both consumer and commercial support to its current ranking as the most popular Linux distribution. OpenSUSE, with its business underpinnings, has always been popular in Europe and has been making inroads in the U.S. And it is largely thanks to Fedora that Red Hat has become the biggest Linux company with a major role in community Linux.