Steam Link is a free application made to stream Steam games from a host computer, the Raspberry Pi version was released in Beta on December 3 2018, then released in full on December 13 2018. This app was designed to mimic the functionality of it’s hardware namesake. Unlike most PC ports to the “Pi,” this version was specifically designed by Valve themselves to run on the Raspberry Pi’s flagship OS, Raspbian.
The following information has been compiled from the official Steam Link “About” Page:
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The Steam Link app is available free of charge, streaming your Steam games to phones, tablets, and TV. No download or service fees apply. The Steam Link app supports the Steam Controller over Bluetooth, as well as other popular Bluetooth controllers, mice, and keyboards. Simply download the app and connect to your host computer running Steam to expand the range of your Steam gaming experience.
Steam Link (Raspberry Pi)