CAD program using GUI, procedural programming and inheritance - from 1963,

here is the wikipedia page for the program: http://en.wikipedia.org/wiki/Sketchpad

Truly impressive and lightyears ahead of its time.

alan-kay: "how could you have possibly done the first interactive-graphics, the first non-procedural programming language, first object-oriented software-system all in 1 year" ?

ivan-s: "i didn't know it was hard" !!!