GeForce Now is Nvidia's cloud gaming service with a free plan that gives you access to game you already own on Steam, Epic, GOG and Ubisoft's libraries. Games can then be streamed to play on Shield TV, Windows, macOS, Android, iOS and even Chromebooks.
Install Plex Media Server on your PC or NAS device and it will organize and let you stream all your media using the Plex App on any device. It's free and works with a variety of platforms, mobile and streaming devices.