There are several editors available on VMS.
The default editor on VMS today.
Activated by:
$ EDIT fnm
Relative little functionality out of the box, but very easily extendible. It is developed in a language called TPU and the full TPU sources of the editor comes with VMS.
The default editor on VMS in the old days.
Activated by:
$ EDIT/EDT fnm
Operates in 3 modes: line mode (can be used for batch editing), nokeypad mode (similar to VI) and keypad mode (normal fullscreen editor).
An extension to EVE supporting programming languages (LSE = Language Sensitive Editor).
Activated by:
$ LSE fnm
Very smart back in the 1980's. The language support is completely outdated today.
Editors like JEdit, Emacs and VIM also runs on VMS.