I was looking to see if Commando would get mentioned. One of the really nice things about Commando was that it would synthesize the command line for you and not just run the command, and it was integrated with the MPW editor. So you could go through the GUI for a program, press a button, and the command-line invocation is pasted into the script you’re editing.

MPW was ahead of its time in a lot of ways, unfortunately behind its time in a couple ways (notably, pipes didn’t work the way they did on Unix—I think there was something like temporary files involved).