GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
S.S.E. File Encryptor - S.S.E. File Encryptor is a cross-platform encrypter/decrypter of files and folders.
Chatlink.com - Anonymous communication platform
VSEncryptor - VSEncryptor is an easy to use file and text encryption program.
Autocrypt - Convenient End-to-End Encryption for E-Mail