Steam Link is an official device for streaming your Steam library

Among the collection of big announcements that Valve made at the Game Developers Conference yesterday was the Steam Link. This device will work with all Linux, Mac, and Windows PCs as well as Steam Machines and will allow users to stream any content in their Steam library to any other compatible device on the same home network. Steam Link will be available for $50 starting in November and for an extra $50 you’ll get a Steam Controller as well.