SerenityOS

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Android

ReactOS is a free and open-source Windows-like operating system for amd64/i686 computers. ReactOS was designed to be binary-compatible with computer programs and device drivers made for Windows Server 2003 and Microsoft Windows NT family of operating systems including Windows NT4, Windows 2000, Windows XP, Windows 2003, Windows Vista and Windows Seven. To Some, ReactOS is a potential open-source drop-in replacement for Windows and for its information on undocumented Windows APIs

Linux is a family of free and open-source Unix-like operating systems based on the Linux kernel. Linux powers many things in the world today, from smartphones to cars, supercomputers and home appliances, home desktops to enterprise servers. Linux was first released in 1991 by Linus Torvalds as a free and open-source project. Today, Linux is typically packaged in a Linux distribution and released under different names. Some of the familiar being Android for mobile devices, or Debian, Fedora, or Ubuntu for desktop computers and servers.

macOS is a series of proprietary operating systems native to the Apple ecosystem. The operating system powers all of Apples desktop and laptop computers and is the second most popular operating system in the world after Windows.

KaiOS is a free an open-source operating system that brings the best of smartphones to affordable mobile devices. With KaiOS you can use popular apps like WhatsApp, YouTube, Facebook, Google Maps, and 500+ other apps available on the KaiStore. KaiOS was built to empower people around the world through technology. With the belief that everyone should have access to the internet to unleash their potential.

Ubuntu Touch is a free and open-source mobile operating system maintained by the UBports community. The OS was first create by Canonical LTD, the company behind the Linux distribution, Ubunutu. With Ubuntu Touch, you can use your mobile devices in a free and open manner. Ubuntu Touch also allows you to turn your phone into a desktop computer using the "desktop mode"

Phoenix OS is an operating system specifcally designed to bring Android gaming to the PC. The OS is based on Android 7.1 and is developed and released free and open-source. With Phoenix OS you can play your Android games on a big screen, with mouse and keyboard support thanks to Octopus keymapping engine and Game Assistant, offering a powerful fundamental keymapping.