History of Sketchpad from 1963. One of the most influential computer programs ever written by an individual.
Proceedings, Free Full-Text
PDF) Before the Altair: The History of Personal Computing
No-code History: Sketchpad - A man-machine graphical communication
A Brief History Of Human-Computer Interaction Technology
No-code History: Sketchpad - A man-machine graphical communication
No-code History: GRAphical Input Language - GRAIL (1969)
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Sketch-Based Modeling in Mechanical Engineering Design: Current