I submitted a beefed up Elisp package for interacting with Caml to the
Ohio State Elisp archive. The main additions are: an indentation
mechanism for Caml mode, and a new debugger mode closely modeled on
gud/gdb.

It is also available as

ftp://ftp.rahul.net/pub/itz/caml-mode-0.72.tgz

;; LCD Archive Entry:
;; caml-mode-0.72|Ian T Zimmerman|itz@rahul.net|
;; (New and improved) modes for editing caml code, running the caml toplevel and debugger|
;; 24-Apr-96|$Revision: 0.72 $|~/modes/caml-mode-0.72.tgz|