Debian
The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system is called Debian.
VS
OpenMandriva Lx
The OpenMandriva distribution is a full-featured Linux desktop and server, sponsored by the OpenMandriva Association. It was based on ROSA, a Russian Linux distribution project which forked Mandriva Linux in 2012, incorporating many of Mandriva's original tools and utilities and adding in-house enhancements.