“Mac GNU Privacy Guard is the Mac OS X port of the popular security utility. I have been using GnuPG for more than 5 years now and it is the best available open source solution for various encryption purposes. This article guides the reader through Mac GNU Privacy Guard installation, as well as its basic functions.”
I use it. It is good.
It integrates with Apple Mail. But it does not integrate with Gyazmail.
It is on the list of things to fix tho’, so I remain hopeful (because I do not like Apple’s mail.app, too flaky).
I think I’m going to have to give it a try later tonight!
Good article and a nice site too. Bookmarked.