GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Seahorse - Front end for GnuPG.
File Encryption XP - A program designed for protecting confidential information stored on your computer.
S.S.E. File Encryptor - S.S.E. File Encryptor is a cross-platform encrypter/decrypter of files and folders.