CentOS 5 is an obsolete, free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RHEL.

CentOS 5 is a free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RHEL. It went end-of-life on 2017-03-31, is now unsupported, and shouldn't be used on production systems.