I am kinda thinking the opposite. Things like a world clock? maybe one You can punch a call in and it tells the local time? Propagation prediction? DX clusters (have no idea what that is). Programs to help point a beam, long or short? I've seen maps with lines all over representing recent contacts, and the band they were made on. for instance, I just downloaded dxlabs installer and installed dxview. Is that even useful today, or are there better tools for the job.
My rigs are so old, and filters so narrow, that there is nothing to be gained with rack gear. Computer interface is too limited and/or expensive too.