Emacs can seamlessly access files over ssh, ftp and/or sudo.

Emacs lets me add custom hook commands to run before a file is saved (to check a file’s syntax using an external command), and after it’s saved (to signal reloading of the file to the relevant process).

Emacs also includes my mail reader, my diary, my organizer, a spreadsheet, an stack-based algebraic calculator, etc. but those may be unfair comparisons. :)

Note: All of the above are part of the built-in functionality of Emacs. Third-party extensions can of course do anything.