While all the major RHEL derivatives are now up to version 6.2 in par with upstream Red Hat Enterprise Linux (see the RHEL vs. Oracle vs. CentOS vs. Scientific Linux benchmarks), ClearOS is still in beta for its 6.2 milestone.
ClearOS, which formerly was known as ClarkConnect, is derived from Red Hat Enterprise Linux / CentOS. While ClarkConnect was known for being a web-based gateway/network server, since the ClearOS 6.1 release it’s been a full RHEL-based OS as well.