Yep. It supports several "integrations" [0], but I typically just send notifications (to my mobile devices) from shell and Python scripts running on my machines

Yep. It supports several "integrations" [0], but I typically just send notifications (to my mobile devices) from shell and Python scripts running on my machines -- they even have examples on their front page. It supports acknowledgements (for "emergency" messages, at least) but I'm not sure about arbitrary "responses" (although you can include clickable links in the notifications). Pushover's awesome -- and made by @jcs [1] who, among other things, works on OpenBSD. -- [0]: https://pushover.net/apps https://pushover.net/apps [1]: https://jcs.org/ https://jcs.org/