Apps similar to Qubes OS include Linux Mint, which is free and open source. Other options are Ubuntu, Debian, Fedora and Arch Linux. There's no shortage of Operating Systems like Qubes OS, with more than 100 alternatives for Linux, self-hosting, Mac, Windows and Chrome OS.
SparkyLinux is a Debian-based Linux distribution which provides ready to use, out of the box operating system with a set of slightly customized lightweight desktops.
Ubuntu Core, a minimalist rendition of Ubuntu , is a lightweight, transactionally updated operating system designed for deployments on embedded and IoT devices, cloud and more.
antiX is a fast, lightweight and easy to install systemd-free Linux live CD distribution based on Debian Stable for Intel-AMD x86 compatible systems.
Edubuntu is an Ubuntu-based operating system that's designed for educational use in schools and other educational institutions.
United Kingdom
Kodachi is a Debian-based distro which can be run from a DVD or USB thumb drive. It filters network traffic via a VPN and Tor, obscuring the user's location. It attempts to clean up after itself, removing traces of its use from the computer.
Oman
SliTaz is a free operating system, working completely in RAM and booting from removable media such as a CD-ROM or USB key. SliTaz is distributed as a LiveCD, and weighs less than 40MB. The system is quick and responsive, clean and robust.
Switzerland
Oracle Solaris is the #1 enterprise OS, delivering breakthrough high-availability, security, efficiency, and industry-leading scalability/performance.
United States
Software for humans of indeterminate age. We don't know how old you are. We don't want to know. We are legally required to ask. We won't.
United States
The CLIP OS project is an open source project maintained by the ANSSI (National Cybersecurity Agency of France) that aims to build a secure, multi-level operating system, based on the Linux kernel and a lot of free and open source software.
United States
MINIX is a POSIX-compliant Unix-like operating system based on a tiny microkernel running in kernel mode with the rest of the operating system running as a number of isolated, protected, processes in user mode.
Netherlands
EU
AnduinOS is a custom Ubuntu-based Linux distribution that aims to facilitate developers transitioning from Windows to Linux by maintaining familiar operational habits and workflows.
China
France
