Just stumbled across this great post
Mobile Opportunity: A quick history of software platforms: How we got here, and where we're going
Well worth the read;
"Autoflow was recognized as the first software product to be commercially marketed. Starting in 1964, ADR licensed its products nationally and through ads in all the major computer publications, started investing in the development of other products and became known as a software products company."
I love this quote
"They named it Autoflow, and wrote a letter to all 100 RCA mainframe owners offering them the program for $2,400 on a three year lease. It was three milestones in one: the first commercial software program, the first subscription software, and the first junk mail urging you to buy a software program."