BitCrypt is a free ultra-strong encryption that hides text in bitmaps.
A family of small-state CSPRNGs and Stream Ciphers
A family of FLEA-inspired CSPRNGs and Stream Ciphers
ISC lets you encrypt & decrypt text and files of any type up to 4GB
AES Encryption Program
Decrypt messages encrypted with a substitution cipher
this simple program implements the Vigenere cipher in python