Just to counter-balance the inferred conclusion that Common Lisp would not have any commercial usage (sorry, words are important, FUD is too close from hasty wording or hasty conclusions): https://github.com/azzamsa/awesome-lisp-companies/ (example companies using CL today, and yes some pick it for new projects, and yes some hire) (and I don't want to argue if the list is impressive or not: it's some commercial usage :D best,)