As you may know, Kodi (previously named XBMC) is a famous open source media hub and home theater PC, being translated in more than 30 languages. Also, its features can be highly extended via third party plugins and extensions and has support for PVR (personal video recorder).
Recently, the developers have announced the immediate availability of Kore 2.0, which is a great Android app which can be used as a remote control for the Kodi-based media hub.
Among others, Kore 2.0 received the possibility of running addons directly via the phone, without requiring to enter the Kodi interfae, support for sending YouTube videos to Kodi has been added, the the directional keys are now properly controlling the video playback.
Install Kore 2.0 from the Google Play Store