[Notica](https://notica.us) allows you to send browser notifications from your terminal to know when a slow command has finished running. It doesn't require installing anything or registering an account. It also works over ssh unlike `notify-send`.
You can find the [source code](https://github.com/tannercollin/Notica) on Github.
I do most of my work on remote servers over ssh. When running a slow command (like `apt install`) I'll distract myself by browsing sites like my other project [[QotNews]]. The command will finish running, but I'll still be wasting time reading news articles. Notica helps me stay on track by alerting me when the command finishes.