MacPaint and QuickDraw shipped with the original Macintosh in 1984. MacPaint is a bitmap painting app that came bundled on the original Mac, and QuickDraw is the graphics library--the piece of the operating system that handles onscreen graphics such as windows and icons--that powered the original Mac OS.
The MacPaint source code download is roughly 68KB, and the QuickDraw source code weighs in at a hefty 180.4KB (i.e. smaller than some Word files!).
Curious? Check out the Computer History Museum's Website for the source code downloads. Not a programmer? Be sure to read the history behind the software, and some amusing anecdotes.
[Computer History Museum via Daring Fireball]
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This story, "Original Mac Software Source Code Now Available for Download" was originally published by PCWorld.