Ubuntu Server is described as 'The leading platform for scale-out computing, Ubuntu Server helps you make the most of your infrastructure. Whether you want to deploy an OpenStack cloud, a Hadoop cluster or a 50,000-node render farm, Ubuntu Server delivers the best value scale-out performance available' and is a operating system in the os & utilities category. There are more than 100 alternatives to Ubuntu Server for a variety of platforms, including Linux, Self-Hosted, BSD, Windows and Mac apps. The best Ubuntu Server alternative is Debian, which is both free and Open Source. Other great apps like Ubuntu Server are Fedora, Tails, Manjaro Linux and openSUSE.
AcademiX GNU/Linux is a Debian-based Linux distribution developed specifically for education. The distribution was built on the Debian Linux (Stretch / Buster) distribution and contains free software for education.
A new OS/2-based operating system from Arca Noae, codenamed Blue Lion, arrived today, May 15, 2017, after nearly two years in development.
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.
AmigaOS is the proprietary native operating system of the Amiga and AmigaOne personal computers, introduced with the launch of the first Amiga, the Amiga 1000, in 1985.
Mythbuntu is a community supported add-on for Ubuntu focused upon setting up a standalone MythTV based PVR system. It can be used to prepare a standalone system or for integration with an existing MythTV network.
Visopsys (VISual OPerating SYStem) is an alternative operating system for PC-compatible computers, written “from scratch”, and developed primarily by a single hobbyist programmer since 1997.
Astral is a 64 bit operating system with its own kernel written in C for the x86-64 architecture.
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