GNU Hurd is described as '(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' and is an app in the OS & Utilities category. There are four alternatives to GNU Hurd for Linux and Self-Hosted solutions. The best alternative is Linux kernel, which is both free and Open Source. Other great apps like GNU Hurd are Linux-libre (Free, Open Source), Redox (Free, Open Source) and XNU (Free, Open Source).
Linux-libre is a GNU package that is maintained from modified versions of the Linux kernel. The aim of the project is to remove any software that does not include its source code, has its source code obfuscated or released under proprietary licenses.