The standard OCaml library is nice, but is lacking in some ways. ZUtils is an overlay of libraries to address what is lacking in the standard library. It is also designed to work on top of ExtLib. There are a few exceptions (hashtbl and set). Download here.

• Provides some abstract data types (eg. Foldable).
• Fixes polymorphic compare, hash, and provides polymorphic print, etc.. See my caml-list post "on polymorphic compare and objects" here for details.
  • These generic polymorphic functions will call the appropriate method when applied on objects. This means you can write the appropriate behavior for an object type. For standard types (eg. tuples) the behavior is the same as before. This means if you create a type whose correct compare behavior is not realized by, say, structual comparison, you should wrap it in an object and implement the correct method.
  • All library functions use the new generic polymorphic functoins (eg. List.assoc). This means you never need worry that, for example, List.assoc will fail on a user defined data type because its equality is not structural or because it has a functional value inside, etc..
  • More general library functions. Eg. Hashtbl can be created to use any hash function (without use of a functor)
• Plotting library based on mlgrace. Mostly it provides some functional convenience methods
• Misc conveniences (eg. function composition, I/O conveniences like readlines (string -> string list))