Geeklog is a content management system (CMS) with support for comments, trackbacks, multiple syndication formats, spam protection, and all the other vital features of such a system.
http://www.geeklog.net

FreeBSD is an advanced operating system derived from BSD, the version of UNIX® developed at the University of California, Berkeley.
http://www.freebsd.org/

Community Supported Enterprise Operating System.
http://www.centos.org/

Ubuntu is a fast, secure and easy-to-use operating system used by millions of people around the world.
http://www.ubuntu.com/