CentOS versions download: here

"The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL). Since March 2004, CentOS Linux has been a community-supported distribution derived from sources freely provided to the public by Red Hat. As such, CentOS Linux aims to be functionally compatible with RHEL.

The CentOS Project is a community-driven free software effort focused around the goal of providing a rich base platform for open source communities to build upon. We will provide a development framework for cloud providers, the hosting community, and scientific data processing, as a few examples. We work with several ‘upstream’ communities to help them layer and distribute their software more effectively on a platform they can rely on.

The CentOS Project is modelled on the structure of the Apache Foundation, with a governing board that oversees various semi-autonomous Special Interest Groups or ‘SIGs’. These groups are focused on providing various enhancements, addons, or replacements for core CentOS Linux functionality. A few notable examples of SIGs are:

Core - Building and releasing the core CentOS Linux platform. Xen4CentOS - Providing Xen4 support for CentOS 6 CentOS Design - Improving the user experience with high quality artwork."*

*find more here: https://www.centos.org/about/