AsteriskNOW is an open source Software Appliance based on CentOS. As it provides a modified kernel, please don’t ask for help on CentOS channels but seek help from them. Quoting from their document, AsteriskNOW 1.5.0 released: “As always, please use and for issues and feed.”


BlueOnyx is a sub- or successor fork of BlueQuartz, it seems.


BlueQuartz was a community successor to the commercial Cobalt Qube and Raq distributions. The products were bought by Sun Microsystems and then abandoned in fairly short order. It appears to have been abandoned since 2007. (As to updates, early 2009.) Part of its updates were pulled from CentOS or upstream SRPMs.


CactiEZ is based on CentOS. See for more details on their update policy.


CentServer takes CentOS-5 & RPMforge packages and then repacks / distributes (maintains?) their own version and repository. TruHuynh could not find the corresponding SRPMS at the time of this writing.


ClarkConnect is based on CentOS but uses their own repositories. (See, for instance, the CentOS RPMS in


ClearOS (formerly called ClarkConnect) is based on CentOS, according to


Elastix is based on CentOS-5 but requires the use of a deprecated CentOS-5.1 kernel (forum post), as of 2008/10/20. Update – as of 2010/10/10 they appear to be using a stealthily modified CentOS 5.5 kernel per this forum thread.


FAN’s (Fully Automated Nagios’) goal is to provide a CD based on CentOS.


OpenNode is another rebranded build (“OpenNode ISO installer will setup a minimal CentOS 5 server system . . .”).


OpenVZ is container-based virtualization for Linux and the basis for Parallels Virtuozzo Containers (see below). It is a fork of CentOS which uses a number of non-standard packages (including the kernel) and is not supported by the CentOS community.

Oracle Unbreakable Linux

Oracle Unbreakable Linux is presently (2010) a rebuild of Red Hat Enterprise Linux, not CentOS. It is a commercial product with support provided by Oracle. There are some additional patches applied to the RHEL SRPMS.

OS Office

OS Office (OSPanel theme for BlueOnyx) is a hosting provider that supplies an OS based on CentOS 4.8 but with an el5 kernel. See the discussion at the CentOS Forum.

Parallels Virtuozzo Containers

Parallels Virtuozzo Containers is an operating system virtualization solution. As with OpenVZ, it is not supported by the CentOS community.


PBX in a Flash is based on CentOS. It has its own custom installer and post-install scripts, along with its own update mechanism. From “If you update your CentOS configuration, you will need to reinstall it (PIAF) by running update-scripts, then update-fixes, and then install-netconfig.” Hence, ask **them** if you break something.

R-fx add-on packages

R-fx adds packages which have been reported, on IRC, not to play well with the CentOS IPTables packet filtering and configuration tools.

Scientific Linux

Scientific Linux is a rebuild of Red Hat Enterprise Linux by Fermilab and CERN. It applies some (relatively) minor changes to the RHEL sources and adds some packages.


sipX is using CentOS-4 as its base. Ask questions related to sipX at #sipx on For bug reports go here.

SME Server

SME Server is an outgrowth from the former Mitel ‘e-Smith’ in-house Linux distribution, which was set free back in the ‘Red Hat Linux’ days.


Snaplogic (and its commercial parent) seems to use a later Python version and make pervasive changes.

trixbox (formerly Asterisk@Home)

trixbox is based on CentOS. See the trixbox FAQs: What about other hardware? How do I know if a particular NIC or motherboard is compatible?


The trixswitch ISO install package is a CentOS-based CD-ROM image that creates a boot CD which will automatically install a CentOS variant and FreeSWITCH.


VicidialNOW is a Linux Distribution, based on CentOS, that claims to provide a full ‘Call Center Suite System’. It will automatically install Vicidial, Mysql, PHP, Asterisk, VtigerCRM and other open source components.

Whitebox Enterprise Linux

Whitebox Enterprise Linux is based on Red Hat Enterprise Linux. Its goal was to provide an unencumbered RPM based Linux distribution that retained enough compatibility with Red Hat Linux to allow easy upgrades and also to retain compatibility with Red Hat’s Errata SRPMS. Only EL3 and EL4 are available as of the date of this writing.

<!> The text on this page is largely quoted from those projects, along with the links cited, and do not necessarily represent the opinions of CentOS.

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