The GNU Project chose the multiserver microkernel for the operating system, due to perceived advantages over the traditional Unix monolithic kernel architecture

Debian

Debian (/ˈdɛbiən/), also known as Debian GNU/Linux, is a free and open source Linux distribution, developed by the Debian Project, which was established

GNU

Linux systems should be considered GNU systems with Linux as the kernel. Proffitt, Brian (July 12, 2012). "Debian GNU/Linux seeks alignment with Free Software

Linux kernel

was created by Linus Torvalds in 1991 and was soon adopted as the kernel for the GNU operating system (OS) which was created to be a free replacement for

Linux

the kernel and supporting system software and libraries, many of which are provided by the GNU Project. Popular Linux distributions include Debian, Fedora

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GNU Hurd