Some text editors are small and simple, while others offer a broad and complex range of functionality. For example, machines with Unix-like systems typically use vi or Emacs to edit many system configuration files which are in plain text, while Microsoft Windows systems use the simpler Notepad program.
Well-known editors: ed, edt, edlin, Emacs, pico, qed, Red (an editor for VAX/VMS, written in the Forth variant STOIC), sam?, teco, Vi, VIM.