Rasbperry Pi Steam Link
Valve announced that the Steam Link App is now available, for free, for those using Raspberry Pi 3B and 3B+ running Raspbian Stretch.
The app, which debuted in beta last week, allows gamers to stream their Steam games library from their computer to other areas of the house via the home network using these Raspberry devices.

You can find out more about Steam Link at the official Steam Link landing page.