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Markup was written in 1975 by William Newman. It was the first bitmap graphics editor (i.e., paint program) for the Xerox Alto[1] written in BCPL.[2]

  1. http://www.cs.cmu.edu/~amulet/papers/uihistory.tr.html
  2. http://www.digibarn.com/stories/desktop-history/bushytree.html
Photoshop Branch
Influenced by
Xerox Alto
Markup Influenced
Doodle