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ecobee - The smarter wi-fi thermostat
Nim Home Assistant (NimHA) - Nim Home Assistant is an open-source home automation platform running on Nim.
Nest Thermostat (3rd gen) - A slimmer, sharper, sexier thermostat
My Devices - Drag and drop IoT project builder for Raspberry Pi
Vivint Element Smart Thermostat - A smart wireless thermostat that blends comfort and savings