Not sure it "means" that but you will find lots on the net. You would most commonly be looking to download to your hard disk and install from there. Some programs may be self installing, others may be something like a zip file where you extract and put in a folder of your choice.

You still haven't set out your aims BTW. I'd hazzard a guess that maybe (and sorry Malcolm - I have my reservations too...) Noteworthy or Melody Assistant are probably amongst the ones you are thinking about.