GNU-Darwin is described as 'aims to be the most free software distribution. Our mission is two-fold: Focus on projects that leverage our unique combination of Darwin and GNU, and help users to enjoy the benefits of software freedom' and is an app in the OS & Utilities category. There are more than 100 alternatives to GNU-Darwin for a variety of platforms, including Linux, Self-Hosted solutions, BSD, Windows and Mac. The best alternative is Debian, which is both free and Open Source. Other great apps like GNU-Darwin are Linux Mint (Free, Open Source), Manjaro Linux (Free, Open Source), Arch Linux (Free, Open Source) and Windows 10 (Paid).
antiX is a fast, lightweight and easy-to-install linux live CD distribution based on MEPIS and Debian's testing branch for Intel/AMD x86-compatible systems. antiX offers users the "Magic of MEPIS" in an environment suitable for old computers.
illumos is a free and open-source Unix operating system. It derives from OpenSolaris, which in turn derives from SVR4 UNIX and Berkeley Software Distribution (BSD). illumos comprises a kernel, device drivers, system libraries, and utility software for system administration.
Sabayon is a Gentoo-based GNU/Linux Operating System designed for speed and ease of use. With the ability to use Gentoos Portage or Sabayons own Entropy system, the ability to compile a program for your needs or simply install a pre-built binary has never been easier.
Pardus is a GNU/Linux distribution funded and developed by the Scientific & Technological Research Council of Turkey. Pardus’ main focus is home use and office-related work with a user-friendly graphical interface usind Deepin De, Gnome or Xfce environments.