LNXLink - Link your Linux computer into Home Assistant
LNXlink | LNXlink
https://bkbilly.gitbook.io/lnxlink
Effortlessly manage your Linux machine
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.