I use HAMRS too.
For FT-8 I use wsjt-x and gridtracker and occasionally flrig depending on the radio.
I also use https://time.is/ to check my time, but I haven't needed a separate app to keep it accurate enough - just the built-in time sync.
I haven't done any research yet but I'm looking forward to finding something that will decode weather satellites and sstv.
Update: MultiScan3B works for sstv on OS X