Let the sun turn your Hue lights on automatically.
An easy-to-build humidifier with RGB backlight that can be controlled by Amazon Alexa.
Run scripts on your RPi/Linux device when voice commands are issued to Alexa. An AWS account is needed but the free tier is used (no cost).
This control board integrates with Arduino to allow users to control all aspects of a smart home through a website or Alexa voice commands.
A nightlight lantern powered by Alexa Home Skill.
Build a smart lamp that can be controlled by flipping a switch and Alexa, for only $35.