cryptlib 

Security toolkit with strong encryption and authentication. Supports many algorithms for symmetric/asymmetric encryption, authentication, and hashing. Free for non-commercial/shareware projects. Written in C. ActiveX and C++ wrappers are available.
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HashTab 

A windows shell extension which installs a new tab with file hash information. Includes MD5, SHA1 and CRC032. Also allows for easy hash comparison. Great for verifying downloads without requiring any external tools.
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DLOCK2 

DLOCK2 is a simple command line file encryption/decryption utility program that uses the free Diamond 2 Encryption Algorithm. Full source code included. Version 2.01 is the same as the original DLOCK2, except recompiled for the Win32 command line.
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Cipher - A Cryptogram Game by uuba.com 

Challenge your mind with great quotes and bad jokes. Cipher is a word game to unscramble phrases by correctly substituting letters of the alphabet into the puzzle - hence deciphering the phrase. Evaluation edition has 100 puzzles.
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NCrypt TX 

NCrypt TX is a text based cryptographic tool with hashing capabilities. Supports DES, Rijndael-AES, SHA, and MD5 algorithms. Convert your e-mail or other messages into a sequence of hexadecimal characters.
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AES Pro 

AES Pro is the suite of encryption tools for personal and professional security.
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