Nest
The Nest project is a learning thermostat that controls your home's central heating system and learns about your habits to ensure that your home is always at the optimum temperature while also saving energy when you're not home.
Nest was recently acquired by Google who maintained its open platform API, allowing us programmers to continue to build solutions to work with it.
Find out more about the Nest API on the nest developer website at http://bit.ly/nestapi.