Build a Digital Signage Software

I would like to build my own Digital Display Sofware that has the option to send scheduled promotions, to display TV's or Monitors. The concept examples would be exactly like the following websites that already exist, please get trials from the following sites and test their applications: [login to view URL] (Prefered) - Perfect Example -1 Chrome Sign Builder - Perfect Example - 2 - [login to view URL] [login to view URL] [login to view URL] - ( Open Source - Might be a good start because these people have already designed it and done 80% of the coding and work for this project) I would like to use an Android Boxes that sits behind the TV's or Monitors, and would like an APK file that needs to be installed on the Android unit and it automatically updates. from the cloud.