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GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
OpenKeychain - OpenKeychain helps you communicate more privately and securely.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
S.S.E. File Encryptor - S.S.E. File Encryptor is a cross-platform encrypter/decrypter of files and folders.
WebPG - WebPG is a free, open source suite of tools to bring https://alternativeto.