EDCrypt 

EDCrypt is an ActiveX control performing following functions: - encrypts and decrypts data using 6 strong symmetrical block ciphers - computes message digests of data using 18 hashing algorithms - securely shreds files
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QuickCrypt Library 

Fast, highly optimized implementation of symmetric (private-key) encryption algorithms: DES, Triple DES (3DES), DESX, BLOWFISH, RIJNDAEL (AES-Advanced Encryption Standard),GOST. Allows to encrypt/decrypt files, memory blocks, strings, streaming data.
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SecExMail Home 

SecExMail makes e-mail encryption as easy as sending a message. There are no plugins necessary and it will work with any standard email client including Microsoft Outlook, Outlook Express, Calypso, Eudora and many more. Includes html email filters.
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Crypton 

Crypton is a multi-utility security suite, which provides strong security for you files
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Cynapse MailCryptor 

MailCryptor is an e-mail encryption solution, which enables the user to encrypt e-mail messages. MailCryptor works on a 128-bit symmetric encryption algorithm, which ensures the right balance between security and speed of decryption.
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Cynapse InfoCryptor 

InfoCryptor stores and guards important documents/passwords/e-mail addresses/credit card information or any other sensitive information in a single, secure location. Infocryptor works on a 448-bit symmetric encryption algorithm.
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