Love this service!

I use it to send commands and URLs between my devices.

On Linux you can do `ntfy sub` and on android you can have Tasker react when a ntfy notification arrives based on its title and contents. So on just about all my devices I have a background script running that is subscribed to a "DeviceCommands" channel that checks if the Title of new messages contains the device hostname or not. If it does it triggers a script based on the contents of the body.

E.g.:

Title: Pixel8

Message: https://kagi.com

Will automatically send the URL to my browser.

Or:

Title: LivingRoomPC

Message: Shutdown

Will shut down the computer.

For people in the iOS / Apple ecosystem, check Hyperduck which is a neat app to do this