I wonder what kind of programs get to follow you for so many decades.
[0] Well, a WM/DE of course, either Stumpwm or Plasma. And pdfpc[1] is really pretty fantastic for showing "Beamer" (pdf) slides. And syncthing for sync'ing between machines.
ImageMagick is another one that has been around for almost 30 years, and is the Swiss army knife of batch image processing on any platform.
And in a way.. MS Office has been forever, even though it changed a lot in the recent years .. Excel is still Excel.
I suppose it could be seen as vi to Vim, though.