tuareg-mode | An emacs-mode for ocaml programs | Mehr ...
It handles automatic indentation of Objective Caml and Caml-Light code. Key parts of the code are highlighted using Font-Lock. It provides support to run an interactive OCaml toplevel and debugger. It works both with FSF Emacs and XEmacs. . This mode attempts to give better results than the one provided in the standard distribution of OCaml and which is available through the ocaml-mode package. Indentation rules are slightly different but closer to classical functional languages indentation. Tuareg-mode gives access to some functionalities from ocaml-mode when that package is installed.