Also, to say there's only one piece of software that does something, with a library as big as the C64's is a little short-sighted. Don't forget how much of that software is probably lost to history.
It's almost certain that if one program for the C64 did something, another one did exactly the same thing, maybe better.
It's almost certain that if one program for the C64 did something, another one did exactly the same thing, maybe better.