CryptoLab

CryptoLab is a freeware cryptography application for Microsoft Windows, and incorporates text-based encryption / decryption through the use of plug-in cipher modules.

Advanced features include SMTP email support, a Key Manager and pseudo-random key generation.
Features list:
Plug-in cipher modules.
Advanced pseudo-random key generation.
Easy-to-use tabbed interface for text files.
Key Manager storage utility.
Full password protection (incorporating SHA-1 hashing algorithm).
Integrated SMTP email support.
PDF, HTML and Word Document export options.
Statistics calculator.
Included encryption modules:
Affine Shift
ARCFOUR
Blowfish Cipher
Caesar Cipher
Data Encryption Standard
Modular Shift Algorithm (by EJC Cryptography)
Rijndael (American Encryption Standard)
Substitution Cipher
Vigen