SteamOS

SteamOS is a Valve developed operating system with great emphasis on it being meant for gaming as it comes with Steam preinstalled which is the company's video game storefront. SteamOS is a Linux distribution, based on Arch Linux, and is used primarily for Valve's first-party gaming hardware, including the Steam Deck, Steam Machine, and Steam Frame but also runs on third-party hardware. Starting in 2025, Valve added support to include third-party devices. This included handhelds like the Lenovo Legion Go and Asus ROG Ally. It can alternatively be installed on personal computers but comes without official support from Valve at this moment in time although this could change in the future. The core of the operating system is free and open-source software, while the Steam client remains proprietary.