This is an adapted Screenly version by the FSG. Feel free to to play with it. ATM this is adapted to our needs and may not be usable for general use.
The main things added are a simple authentication for managing a screen, and an aggregator for multiple screens.
If you want a more polished, turnkey-solution for managing multiple screens, check out the friendly people from ScreenlyApp.com, the people behind the original Screenly project.