CentOS is described as 'Community-supported, free and open source operating system based on Red Hat Enterprise Linux. It exists to provide a free enterprise class computing platform and strives to maintain 100% binary compatibility with its upstream distribution' and is a very popular Linux Distro in the os & utilities category. There are more than 100 alternatives to CentOS for a variety of platforms, including Linux, Self-Hosted, Windows, Mac and Raspberry Pi apps. The best CentOS alternative is Linux Mint, which is both free and Open Source. Other great apps like CentOS are Ubuntu, Arch Linux, Manjaro Linux and elementary OS.
It's close, but not close enough