The CentOS Linux distribution is a stable, predictable, manageable and reproduceable platform derived from the sources of Red Hat Enterprise Linux (RHEL).
Corel supports the Linux community and is committed to developing products for the Linux operating system, including Corel LINUX OS, Corel's Linux distribution; WordPerfect Office, Corel's office suite; and CorelDraw, Corel's graphics suite.
an advanced operating system for x86 compatible, DEC Alpha, and PC-98 architectures. It is derived from BSD UNIX, the version of UNIX developed at the University of California, Berkeley
The openSUSE project is a worldwide community program sponsored by Novell that promotes the use of Linux everywhere. The program provides anyone with free and easy access to the world's most usable Linux distribution, SUSE Linux