Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X, and PureDarwin is a community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin.
Windows 8 Alternatives
Windows 8 is described as 'Operating system that is optimized for tablets, desktops and hybrid devices. It features the new Modern UI (formerly called Metro-Style) that is designed for touchscreen, mouse, keyboard, and pen input' and is a very popular operating system in the os & utilities category. There are more than 50 alternatives to Windows 8 for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best Windows 8 alternative is Windows 10. It's not free, so if you're looking for a free alternative, you could try CentOS or Raspberry Pi OS. Other great apps like Windows 8 are GhostBSD, Univention Corporate Server (UCS), OpenMandriva Lx and Bodhi Linux.
Alternatives list
GNU-Darwin 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.
RetroBSD is a port of 2.11BSD Unix intended for embedded systems with fixed memory mapping. The current target is Microchip PIC32 microcontroller with 128 kbytes of RAM and 512 kbytes of Flash.
Vinux is a Ubuntu derived distribution optimised for the needs of blind and partially sighted users. By default Vinux provides two screen-readers, Braille display support and an extremely friendly community.
