It's gotta be emacs for me. C-h o, and helm-apropos make it super easy to investigate anything in the system. And the help pages link back to the source code (t

It's gotta be emacs for me. C-h o, and helm-apropos make it super easy to investigate anything in the system. And the help pages link back to the source code (though this isn't unique to emacs) The online docs aren't bad either.