Who can forget Smalltalk? (Everybody. It was a long time ago and nobody used it.)
I just saw an oblique reference on folklore.org, but Smalltalk was a graphical environment where everything on the screen was an object, and you could trigger a menu on any object to display its code. You didn't have to dig through the page's code to find the object of your interest.
I was sad when the object-oriented dreams of the 1980's degenerated to the stream-of-text model of Unix and Windows. And Java is a very poor imitation of an object-oriented language. We're gradually rebuilding, but it's so slow compared to those days, and it's an uncomfortable fit on the Unix base.