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Maybe GNU Emacs, because it was originally written for Unix. Emacs itself came from ITS/Teco. Lisp-based Emacs came from the MIT Lisp Machine (using Lisp Machin

by lispm 11y ago

Maybe GNU Emacs, because it was originally written for Unix. Emacs itself came from ITS/Teco. Lisp-based Emacs came from the MIT Lisp Machine (using Lisp Machine Lisp as implementation language) and Multics Emacs (using Maclisp as implementation language).