KeePassXC - KeePass Cross-Platform Community Edition - A community maintained fork of the popular KeePassX...
Encrypto - Encrypto lets you encrypt files before sending them to friends or coworkers.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
EncFSMP - EncFSMP, a program to mount EncFS folders on Windows and OS X.
Seahorse - Front end for GnuPG.
Unicode Crypter - Encrypt and Decrypt Unicode!