These macros can be used in your scripts without additional configuration:

ppx_deriving.eq
Provides the [@@deriving eq] macro to compare values for equality.
ppx_deriving.ord
Provides the [@@deriving ord] macro to compare values for a total order.
ppx_deriving.show
Provides the [@@deriving show] macro to define pretty printers for values.
ocaml-monadic
Provides let%bind, if%bind and match%bind macros to simplify sequential (monadic) code.