SteamOS, Zorin OS and other special distributions

In short: Besides the big distributions there are special systems: SteamOS for games, Zorin OS for Windows switchers, Tails and Qubes for privacy, Raspberry Pi OS for mini computers.

In more detail: They are usually tailored to one goal and use existing families for that.

In detail

• SteamOS: Valve’s system for the Steam Deck, Arch-based with KDE Plasma in desktop mode and an immutable image. Proton translates Windows games.
• Bazzite, Nobara, ChimeraOS: game-oriented systems based on Fedora.
• Zorin OS: Ubuntu-based, interface can be switched to a Windows or macOS look.
• Tails: runs from a USB stick, routes everything through Tor, leaves no traces.
• Qubes OS: security through isolation, each task in its own virtual machine.
• Kali and Parrot: penetration testing tools (Kali Linux).
• Raspberry Pi OS: Debian-based for the Raspberry Pi.
• Alpine: tiny, for containers (Alpine Linux).
• Android: uses the Linux kernel but is not a classic distribution.

See also: Linux distributions: family tree, Linux distributions