Linux kernel
The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems.
GNU Hurd (usually referred to as the Hurd) is a computer operating system kernel designed as a replacement for Unix, released as free software under the GNU General Public License.
GNU Hurd (usually referred to as the Hurd) is a computer operating system kernel designed as a replacement for Unix, released as free software under the GNU General Public License. It has been under development since 1990 by the GNU Project of the Free Software Foundation.
operating-system os-kernel