ReactOS is described as 'FOSS effort to develop a quality operating system based on the architecture of Microsoft® Windows NT family of operating systems, that is compatible with applications and drivers written for it (NT4, 2000, XP, 2003, Vista, 7)' and is a very popular operating system in the os & utilities category. There are more than 100 alternatives to ReactOS for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best ReactOS alternative is Linux Mint, which is both free and Open Source. Other great apps like ReactOS are Fedora, Arch Linux, CachyOS and Zorin OS.
The AROS Research Operating System is a lightweight, efficient, and flexible desktop operating system, designed to help you make the most of your computer. It's an independent, portable and free project, aiming at being compatible with AmigaOS at the API level (like Wine...
The Zeal Operating System is a modernized, professional fork of the 64-bit Temple Operating System. Guiding principles of development include transparency, full user control, and adherence to public-domain/open-source implementations.
Brazil
India
Athena OS is an Arch-derived Linux distribution designed for penetration testing, bug-bounty hunting and InfoSec students. The distribution provides a way to connect directly to some of the e-learning hacking resources, such as Hack The Box, Offensive Security, PWNX and InfoSec...
An Ubuntu Distribution that aims to make the switch to Linux easier, simpler and faster not just for Windows users but also Mac and Linux Distro users alike for free. Feren OS aims to be one of the best Distros, if not OSs out there...
CrunchBang++ is an open source and completely free [of cost (#!++ does include several of Debian’s non-free packages as well as the non-free repository)] computer operating system, designed as a continuation of the .
EasyOS is an experimental Linux distribution that uses many technologies and package formats pioneered by Puppy Linux .
Australia
Chromium OS is an open-source project, used primarily by developers, that aims to build an operating system that provides a fast, simple, and more secure computing experience for people who spend most of their time on the web.
Cloud-first, fast, easy-to-manage, and secure operating system for PCs and Macs. ChromeOS Flex is a sustainable way to modernize devices you already own. It’s easy to deploy across your fleet or simply try it to see what a cloud-first OS has to offer.
United States
ravynOS is a new open-source desktop operating system that aims to provide a similar experience and compatibility with macOS on x86-64 systems.
Oracle Solaris is the #1 enterprise OS, delivering breakthrough high-availability, security, efficiency, and industry-leading scalability/performance.
United States
