GPGTools - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
GNUPGK - A GnuPG Frontend GUI made in C#.
Pignus Encryption - Pignus Encryption is an encryption platform that allows users to encrypt their messages and documents.
TheLetterEncrypter - TheLetterEncrypter is a small (14KB download) AES-based text-encryption program.
DeliverySlip - DeliverySlip helps simplify, secure, and expedite the burdensome elements of online collaboration...
CTI Text Encryption - CTI Text Encryption is an encryption tool that can encrypt any text from messages and articles to codes, etc.