Nothing, imho. He maintained the jargon file and some irrelevant old unix utilities for a while. His primary achievement was non-technical: taking the radical p

Nothing, imho. He maintained the jargon file and some irrelevant old unix utilities for a while. His primary achievement was non-technical: taking the radical philosophy of free software and neutering it be acceptable to corporations. He also wrote a book[0] with a catchy title that many people referenced and few people read. I think ESR is a dabbler and popularizer who has built his personal brand around being a Man-in-Tech rather than a person who actually produces significant technical contributions. RMS or Torvalds he ain't. [0] https://en.wikipedia.org/wiki/The_Cathedral_and_the_Bazaar https://en.wikipedia.org/wiki/The_Cathedral_and_the_Bazaar