CentOS
Used by 7 peoplecentos.org ↗
“For my servers I have been using Linux CentOS.”
Daniel Cid Interview, Security researcher, developer (OSSEC) · via Uses This 
“The production systems are running CentOS, but we continually consider just biting the bullet and paying for an enterprise Linux distribution so we can legitimately gripe when the security updates are late.”
Jonathan Corbet Interview, Linux kernel contributor, editor (LWN) · via Uses This
