Q4OS is described as 'Fast and powerful operating system based on the latest technologies while offering highly productive desktop environment. We focus on security, reliability, long-term stability and conservative integration of verified new features' and is a Linux Distro in the os & utilities category. There are more than 100 alternatives to Q4OS for a variety of platforms, including Linux, Self-Hosted, Mac, Windows and BSD apps. The best Q4OS alternative is Linux Mint, which is both free and Open Source. Other great apps like Q4OS are Ubuntu, Debian, Fedora and Arch Linux.
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...
BSD-derived desktop OS designed for usability, featuring graphical ports management, GNUstep system configuration, standard tools for daily tasks including email, web browsing, and word processing, supporting multiple licenses like BSD, X.org, and GNUstep.
United States
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.
Peropesis is a small-scale, minimalist, command-line-based Linux operating system. It's an incomplete system, but it's constantly being improved. Also, it is a free operating system created from a free software.
instantOS is a Manjaro based distro that works out of the box but is still aimed at power users. Everything is lightning fast and works out of the box.
MorphOS is an AmigaOS-like computer operating system. It is a mixed proprietary and open source OS produced for the PowerPC processor based computers.
Germany
EU
Live bootable linux CD supported by US department of defense, featuring firefox, thunderbird, word processor, and reads USB flash drives.
This project birth in 2002! blackPanther OS is an independent Linux distribution which is not a fork of anything else. It is designed to be simple, fast, and easy to use... Its motto: just click and use it!.
HungaryEU
Beautiful, Open, and Free - Trenta OS is a Linux based operating system that aims to compete graphically with some well known premium operating systems but in the free & open-source Linux world.
aptosid is an operating system based on the Debian GNU/Linux unstable branch, codenamed sid, and our ISOs hold fast to the core values and the Social Contract of Debian (DFSG).
GermanyEU
dahliaOS is a modern, secure, lightweight and responsive operating system, combining the best of GNU/Linux and Fuchsia OS.
Calculate Linux is based on Gentoo that is well known for its stability and great performance on a broad range of hardware: from Pentium Pro to modern CPUs.
Russia