The predecessor to PowerPoint was Harvard Presentation Graphics.

http://en.wikipedia.org/wiki/Harvard_Graphics

in the era of dirty politics and terrorism MAN KIND and media has forgotten the important milestone !!!

If you haven't already found it, you might want to look at Tufte's superb dissection of PowerPoint at http://www.edwardtufte.com/tufte/books_pp .

I've just come across the software called Articulate Storyline, it is a kind of an advanced form of PPT. Please check the link for further info:

http://www.articulate.com/products/storyline-overview.php

This software had been introduced to us several weeks ago and I thought it would be a good idea to compare the software with the current PPT. Cheers.

See the following to get some insight.

http://en.wikipedia.org/wiki/Forethought,_Inc.

http://www.gbuwizards.com/files/gaskins-ppt-at-20-cacm-vol50-no12-dec-2007-p15-p17.pdf

Appreciate the recommendations everyone! We hope to have the related manuscript submitted in the next month.

Here is the article I recently published related to the original question on which you commented.  Thank you for the suggestions.

PowerPoint: An Overused Technology Deserving of Criticism, but Indispensable. Educational Technology 2014; 54(5):29-34.