Felony is the first PGP app that's easy for anyone to use, without a tutorial. Security++ to the greatest extreme!
You can download compiled versions of Felony for Windows, Mac OS X, and Linux fromhttps://github.com/henryboldi/felony/releases. The app is currently in its pre-release stage, so it hasn't been fully tested on all platforms. Confirmed to be working on Mac, as that's what the developers own.