DeepCoder 

DeepCoder is a program to encrypt, decrypt and/or digitally sign e-mails and files using secret keys (passwords) or public keys. It can be used with any e-mail program or wordprocessor program. No plug-ins are required. Very easy to use!
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Palm SafeHold 

Palm SafeHold is an easy-to-use program that allows you to encrypt/decrypt personal information on your Palm, including addresses, appointments, and memos.
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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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Encrypted Briefcase Personal 

Encrypted Briefcase Personal(EBP) hides folders and secures files with on-the-fly AES encryption. With EBP, there is no need to decrypt each file before you use it and re-encrypt it again when you're done, you just use the encrypted files as normal.
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Crypto4 Files 

Crypto4 Files allows you to securely delete (wipe), pack, unpack, sign, encrypt, verify signature and decrypt files using X.509 certificate right from Windows Explorer.
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Stealth Files 

Stealth Files hides any type of file in almost any other type of file. This is called steganography. This is a way of encrypting data so that it is hard to find. You can not decrypt something unless you know what to decrypt...
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