Chromecast audio streams can now play in the background on Android TV (APK download)
Cast TV for Chromecast/Roku/Apple TV/Xbox/Fire TV APK 11.776 Download for Android – Download Cast TV for Chromecast/Roku/Apple TV/Xbox/Fire TV APK Latest Version - APKFab.com
Here's the new BBC iPlayer app for Android TV (APK download)
Video & TV Cast | Chromecast APK Download for Android - APK MOD