The history of…
IT:
Fresh and Felicia – The History Of Computers, Programming, and Coding: A Not Boring Introduction
Mark Rendle (DevCon 2016) – Keynote session: The History of Programming
SAP:
The Origin of SAP: The Perfect First Customer (SAP celebrate 50 years)
History of ABAP – R/2 -> R/3
Unix:
AT&T Archives – The UNIX Operating System
History of Gnu, Linux, Free and Open Source Software (Revolution OS)
Benno Rice (LinuxConfAu 2018) – A brief history of I/O
Keith Packard (LCA 2020) – A political history of X