Phoronix article: https://www.phoronix.com/news/Steam-Machines-Frame-2026
Also listed here: https://store.steampowered.com/sale/hardware
Valve has already sent support for the new Steam Controller upstream: https://www.phoronix.com/news/New-Steam-Controller-SDL
GoG also sold the modern hitman games which have DRM.
There are also many games on Steam that are DRM free, you may need to use the Steam Client to download them (but possibly also Steam CMD) but then you can copy the files off as a backup and run them without Steam