My list of usefull links for OCaml

General

• The OCaml system release 4.04 - documentation and user’s manual from Institut National de Recherche en Informatique et en Automatique by Damien Doligez, Alain Frisch, Jacques Garrigue, Didier Rémy and Jérôme Vouillon
• Real world OCaml - good introduction to OCaml language by Yaron Minsky, Anil Madhavapeddy, Jason Hickey
• Data Structures and Functional Programming - Cornell university - Computer science lessons

OCaml type, module system

• Unreliable Guide to OCaml Modules - article which explains the OCaml module system.

OCaml libraries

• Batteries - and its documentation. Great community based helper library for everything.