Emacs: List Major Modes

By Xah Lee. Date: 2023-05-20.

To list major modes:

Do Alt+x apropos-command, then type “-mode”. (it's not a complete list, because some major mode's name do not end in “mode”) [see Emacs: Search Function by Name]

Or, look at the variable auto-mode-alist.

auto-mode-alist: Alist of file name patterns vs corresponding major mode functions. [see Emacs: Show Variable Value and Doc]