A couple of years ago, I wrote about Tablo TV, an off-air DVR product. Since then, TabloTV continues to improve with an Apple TV 4 App in the works (real soon now). TabloTV made firmware updates to support the app but the app is still awaiting release.
Plex is a OS independent media server that runs on Linux, MacOS, and Windows. The server component is free with the clients a la carte. There is also a subscription option that enables watching content away from home.
Plex has plugins that allow Plex to present foreign content such as Tablo TV recordings and live TV. I’ve started using Plex to watch the evening news and recorded content. The Plex Tablo plugin has a much nicer interface for viewing content than that in the iPad app. The plugin is unable to manage schedules or recordings but it allows AppleTV 4 to play content without AirPlay from an iPad. My iPad is free for ill-behaved apps like Facebook (network hog).
All of this stuff works well enough that I’ve been using Plex for most of my audio and video playback. The Plex Media Server is mature, the Plex ATV plugin is mature, and the iPad client is mature.
Once the TabloTV AppleTV client becomes available, it should be possible to manage recordings and schedules directly from AppleTV. Until then, the Plex TabloTV server plugin will fill the bill.