Recently updated contribs
Merlin
[21-Feb-2013,
Beta]

Merlin is a tool
which providessmart completion, among other things, in your favorite editor.
As of today, Vim and Emacs are supported.
Otags
[17-Dec-2012, version
4.00.1,
Stable]
An Emacs tag generator for Ocaml source files, working also with syntaxes extended with Camlp4.
Older contribs
Tuareg
[01-Jun-2010, version
2.0.1,
Mature]
Tuareg is a Caml mode for GNU Emacs and XEmacs. It handles automatic indentation of Objective Caml and Camllight codes. Key parts of the code are hilighted using Font-Lock. Support to run an interactive Caml toplevel and debbuger is provided.
ocamlglobaltags
[15-Jun-2009, version
1.0,
Stable]
A source code tagger for OCaml that can be plugged in to GNU Global's tag set up.
Camlanot.vim
[24-Sep-2007, version
0.9,
Beta]

A vim plugin to handle annot files.
LablScintilla
[01-Feb-2007, version
0.9pre1,
Beta]
Caml for Scintilla is a free source and binary package which adds syntax coloring for the Objective Caml language to the multi-platform (Win32 and GTK+) Scintilla editing component and SciTE text editor.
annot
[17-May-2006,
Alpha]
Given a cursor position (line 30, column 20) "annot -type 30 20 main.annot" looks up the type
annotation for that position in main.annot. It is trivial to hook this
to a key in Vim, and probably most other editors.
OMLet
[14-Mar-2005, version
0.10,
Beta]
OMLet provides a much better indentation for Caml/OCaml files than the official one. It mostly behaves as tuareg-mode for emacs does. Omlet supports most of the language features, including objects.
Vim support for .annot files
[06-Oct-2003,
Stable]
A ViM extension that is able to parse .annot files and
print the type of an highlighted (visual mode) part of an ocaml source
file.
Taglet
[27-Aug-2003, version
1.3,
Stable]
OCaml tag file generator.
taggage
[26-Aug-2003, version
1.1,
Beta]
Vim tag file generation for OCaml.
OCaml mode for NEdit
[28-May-2002]
Smart-indent macros and syntax hilighting for OCaml code with NEdit.
tuareg imenu
[09-May-2002,
Stable]
Tuareg imenu is an extesion for Emacs of the tuareg mode (it do not work under XEmacs). It help to have an global visoin of you code
caml-info-look
[19-Mar-2002, version
0.9]
An Emacs minor mode for automatic look up OCaml Info files.
Practical hints for using OCaml
[08-Oct-2001]
Hints which might help you get started with OCaml-development (mostly in UNIX environment).
ocaml.vim
[09-Aug-2001,
Stable]
OCaml syntax file for the VIM-editor.