Here is the driver I created for that app:
https://community.hubitat.com/t/release-join-api-notification-driver/16841
And a few example of the actionable notifications you can create:
Three of the biggest selling points for me were the actionable notifications, the ability to use separate status bar icons for different notifications, and the ability to use the android Category system to truly have unlimited notification sound and display options. My nodered notifications look very different from my Hubitat messages. Some play a certain sound, others make no sound at all because they are informational only. This app lets your imagination loose quite a bit.
Biggest pluses of Pushover was that it supported both IOS and Android, and it also kept a nice sortable history of past notifications. I don't miss the second benefit any longer because I can access my past notifications (not as pretty of pushover) via my phone or pc.