secureblue is described as 'Security-focused, open-source operating system that ships as rpm-ostree container images derived from Fedora Atomic/CoreOS. It emphasizes proactive hardening—such as removing SUID binaries, enabling hardened_malloc, and disabling unprivileged user' and is a Linux Distro in the os & utilities category. There are five alternatives to secureblue for a variety of platforms, including Linux, Fedora, Tor Browser, GNOME and Tor apps. The best secureblue alternative is Tails, which is both free and Open Source. Other great apps like secureblue are macOS, Qubes OS, Whonix and Parrot Security OS.
The Amnesic Incognito Live System (Tails) is a Debian 9 based live CD/USB with the goal of providing complete Internet anonymity for the user. The product ships with several Internet applications, including web browser, IRC client, mail client...
A Unix-based OS for Mac with seamlessly integration with Apple’s ecosystem, offering an intuitive UI, productivity tools like Finder, Spotlight, and Automator, built-in apps like Safari and Photos, Continuity for cross-device functionality, and security features including FileVault and Gatekeeper.
Qubes is an open source operating system designed to provide strong security for desktop computing.
Whonix is a desktop operating system designed for advanced security and privacy. Whonix mitigates the threat of common attack vectors while maintaining usability. Online anonymity is realized via fail-safe, automatic, and desktop-wide use of the Tor network.
Parrot is a GNU/Linux distribution based on Debian Testing and designed with Security, Development, and Privacy in mind.
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