GPGTools is a software collection that brings encryption/decryption and signing of e-mails and files, to you on your mac (for Windows use Gpg4win). The main goal is to bring OpenPGP - in the form of an easy installer package based on MacGPG - to Mac OS X. Read the introduction, in order to get a detailed idea of how PGP works.
The project section provides more information about the included applications and related projects. Should you have further questions that are not listed in the FAQ or if you want to get the latest news, please do not hesitate to open the contact section. Finally, we do appreciate any kind of contributions or donations.