Windows and macOS have similar clients (Hass.Agent for Windows and Home Assistant for macOS).
I’ve found these kinds of clients useful because I can remotely wake-up or sleep computers, track how long they are turned on for, and automatically pause my lights and music when my webcam turns on.
Ooooh! Finally. I have needed something like this to control the volume on my media PC.
I used to have an automation that detects when my HVAC turns on, and it bumps the volume of whatever I’m playing up a few clicks. Then turns it back down when the HVAC cycle finishes. Super handy due to the crazy loud HVAC in my house.