Mailcrypt is an Emacs Lisp package which provides a simple interface to public key cryptography with PGP [and now GnuPG!].
Mailcrypt makes strong cryptography a fully integrated part of your
normal mail and news handling environment
It is a specific project for a Topographical Department, that contains Lisp tools for AutoCad, a desktop system for departament´s internal information management, and a web application for the management level for consultations and solicitations.