For a GUI version, Amphetamine is quite nice (and free). https://apps.apple.com/us/app/amphetamine/id937984704?mt=12

Indeed, many applications I would expect to prevent sleeping (some audio playback ones, games, etc.) don't implement this. I assume it's a case of Apple's APIs changing over the years and not everyone catching up/caring. At one point I had downloaded Amphetamine[^1] but it is much nicer to just use the terminal here.

[^1]: https://apps.apple.com/us/app/amphetamine/id937984704

I was able to install a `caffeine` package with Apt on Linux. In that one the `caffeinate` command is supposed to be run with another command. While the `caffeine` command does what macOs `caffeinate` does.

While it may avoid sleep, it doesn’t prevent inactivity, in my experience. For instance, my chat app at work will still show me inactive while running caffeinate. I have to do non-interactive training semi-regularly and need to interact to keep from looking like I’m away from my desk.

It would be cool to have this activate when a Jupyter notebook is currently running a cell, and deactivate automatically when its finished.