Pebble Smartwatches are quite awesome. You can use them to keep up with your notifications everywhere you go. Pair them with a Raspberry Pi, and you can pull off all kinds of neat things. Take the PebblyPi for instance. It is a smart door bell that notifies you when someone is at your door. All you need is a Raspberry Pi, a switch, a resistor, and your Pebble watch. This is powered by Pushover. Pretty clever if you ask us.