F# is not a derivative of OCAML, though it was that way in the very very first version (pre-1.0). Since then, it has diverged a lot, though it does have the sam

F# is not a derivative of OCAML, though it was that way in the very very first version (pre-1.0). Since then, it has diverged a lot, though it does have the same core syntax and "feel", and even has a flag (--mlcompatility) that allows you to compile a subset of OCAML programs with F#.