I built a robot using Rhasspy - it was a really fun project that involved lots of ideas my kids came up with (I took it and ran with it). Started last winter and now during covid had enough time to pick it up again and get it all running.
In terms of integrations, I wrote some skills to control Kasa-based wifi switches (using pyHS100 - see https://github.com/GadgetReactor/pyHS100 ) and also some skills to control my Logitech Media Server (aka squeezebox).
I used rhasspy-hermes-app to detect Rhasspy’s state (listening, recognizing intent, etc.) and change the color of the LED to show the state, and also to do things like shake the robot’s head when “no” or “never” is spoken, blink the eyes when it’s speaking, etc.
I made a video demonstrating some of the capabilities: https://www.youtube.com/watch?v=SaiJx6dhX4o
Part of the circuit and connectors now implemented on Pi Hat: