JavaScript DES Implementation - This is a javascript implementation of DES, the Data Encryption Standard, supporting ECB and CBC modes. It also includes a function for Triple DES. - http://www.tero.co.uk/des/index.php
JavaScript MD5 - Useful scripts for encrypting strings with MD5, MD4, and SHA-1 algorithms. - http://pajhome.org.uk/crypt/md5/
JavaScript Encryption Program - An open source JavaScript implementation of the RC4, AES, Serpent, Twofish, Caesar and RSA ciphers. - http://home.versatel.nl/MAvanEverdingen/Code/index.html