Edit: also, IIRC Growl was originally called "Notification Center", which is the name that Apple later used for their implementation of similar features
Double edit: I should've RTFA which mentions my fun fact
IIRC, Growl was created because a similar feature of Mac OS didn’t make it into the first release of Mac OS X (sorry, can’t find pictures or documentation online)
If so, I think its developers can’t be completely unhappy about the end result. Also, their code is (3-clause) BSD licensed. If the product lives on in spirit, does it really matter where the code came from?
I never used Mac OS until OS X because I wanted a terminal with Unix userland and also ms office. I don’t know what feature you’re talking about and it was not a consideration when coming up with Growl.
You’re right, but Growl did much more than the notifications in classic MacOS. Also, Apple took their sweet time to get their notification system for OS X.