This new episode of Inverse ATASCI features VisiCalc, originally released in 1980 by Personal Software and later in 1982 released by VisiCorp.
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 for full details.
Link: Inverse ATASCII