Android Thermostat is a fully functional open source thermostat built on Android. It has many features not found in traditional thermostats including the ability to run multiple schedules, track usage and access to an API.

This is the client portion of the application that runs on the thermostat itself and can also run on a phone or tablet to provide a remote control interface. It does not directly control the furnace, but talks to the Android Thermostat Server application.