cl-enumeration
The CL-ENUMERATIONS project contains a Common Lisp Java-like enumeration/iteration library and protocol. Most basic Common Lisp types are handled. The project page can be found at http://common-lisp.net/project/cl-enumeration.
$ area51 add cl-enumerationCopyUsage
;; area51 add updates your .asd automatically.
;; Use the package in your code:
(in-package :my-project)
(cl-enumeration:some-function ...)