HyperCard On The Archive
Hypercard is largely responsible for my love of programming.  As a kid, I would work with my sisters on making games in it.  It was a beautiful combination of half painting program, half drag'n'drop GUI creation that we used to make adventure games.  Each card represented a room, and my sisters would draw on it using the paint tools, and I would follow up after and add invisible buttons over doors and the like to allow for 'moving' through rooms.  We'd then use the built-in MacInTalk speech stuff to make characters say things, too.  Granted, they were silly little games without much point to them, but... as a kid, man.  It was like magic, learning you could have computers do this.I was sad when Hypercard fell out of general distribution with the Mac, but I'm happy to see it here.