VisiCalc, released in 1982 by VisiCorp. Originally released in 1980 by Personal Software. It was written by Dan Bricklin and Bob Frankston under Software Arts, Inc. This program for the Atari 8 bit line of computers was the first commercial spreadsheet for the Atari. There is a very interesting relationship with the company names, see the show links at the bottom of the supplement post for full details.