gnu.org - contains everything you need to research his philosophy. stallman.org - personal website, contains a lot of opinion, but I absolutely respect this ma

gnu.org - contains everything you need to research his philosophy. stallman.org - personal website, contains a lot of opinion, but I absolutely respect this man in all what he says. emacs.org (redirects to https://www.gnu.org/software/emacs/ https://www.gnu.org/software/emacs/) - his non-philosophical work, one of two mainstream text editors for *nix.