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Personal history of Tom Van Vleck. The history of electronic mail and instant messaging, written in 1965 for MIT Computation Center's CTSS timesharing system and later re-implemented on Multics.
Open-source software (OSS) sits at the center of almost every digital technology moving the world since the early 1980s—laptops, cellphones, widespread internet connectivity, cloud computing, social media, automation, all the rainbow flavors of e-commerce, and even secure communications and anti-censorship tools.
Wikipedia1 cites a few different sources on what "Unix Philosophy" is. Peter Salus summarizes it as: Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface. That second bullet point is my favorite: making composable programs rather than monolithic systems. In this way, Unix is designed to be a forge for easily building new tools.