MD5 Message Digest Algorithm  
   Algorithm specification and its implementation in 'C'.
   http://theory.lcs.mit.edu/~rivest/rfc1321.txt

RIPEMD-160 hash function  
   A 160-bit cryptographic hash function designed as a secure replacement MD4, MD5, and RIPEMD.
   http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html

Secure Hash Algorithm Directory  
   MD5, SHA-1 and HMAC information, resources and API's.
   http://www.secure-hash-algorithm-md5-sha-1.co.uk/

Message Authentication Algorithm  
   Algorithm specification and its implementation in 'C' and in BASIC.
   http://www.cix.co.uk/~klockstone/maa.htm

Tiger: A Fast New Hash Function  
   Optimized for 64-bit processors and produces 128, 160, or 192-bit hashes.
   http://www.cs.technion.ac.il/~biham/Reports/Tiger/

Whirlpool Hashing Function  
   A 512-bit hashing function, submitted to NESSIE and selected as finalist. Now also proposed for inclusion in the ISO 10118-3 standard (revision).
   http://planeta.terra.com.br/informatica/paulobarreto/WhirlpoolPage.html

Masher Applet - MD5 implemented in Java  
   Nice online application to produce a MD5 message digest. Supports copy-and-paste function. Includes Java source code.
   http://www3.telus.net/Voiculescu/masher/index.html