ExtLib is a project aiming at providing a complete - yet small - standard library for the OCaml programming language. The purpose of this library is to add new functions to OCaml Standard Library modules, to modify some functions in order to get better performances or more safety (tail-recursive) but also to provide new modules which should be useful for the average OCaml programmer. ExtLib is not directly related to OCaml authors (INRIA) although this library can be seen as a proposal for inclusion in the official distribution.