Launched by Valve about 5 and a half years ago, the Steam Link app has been available free of charge for Android, iPhone, iPad, Apple TV, and Raspberry Pi devices to let you stream your Steam games to phones, tablets, and TV.
Thanks to the awesome developers from Collabora, the Steam Link app is now available for 64-bit Linux systems as a Flatpak app that you can install on any GNU/Linux distribution from Flathub.