If you want to read about the development of PowerPoint by its visionary, you can checkout the book Sweating Bullets by Robert Gaskins:
Dennis Austin was the lead developer and Gaskins was the idea guy/manager.
Dennis Austin was the lead developer and Gaskins was the idea guy/manager.
One can also download the "Sweating Bullets..." book in PDF form for free from his website (listed in the PowerPoint History section on the main page of his website): https://www.robertgaskins.com/powerpoint-history/sweating-bu...
For Aston-Tate's dBase app, there's this blog post about its history: https://www.abortretry.fail/p/the-rise-and-fall-of-ashton-ta...