Jidgen is an easy-to-use, but powerful Java-based id generator. It uses templates for automated id generation and optional collision detection to avoid duplicate ids.
The 'jpwgen' program is a Java-based password generator whose functionality resembles the popular 'pwgen' program. The *nix based version of 'pwgen' is available at http://sourceforge.net/projects/pwgen/.
S/Key - OTP Generator for J2ME architecture. An RFC2289 compliant One-Time Password generator for mobile phone supporting Java language. It uses MD4 and MD5 hash algorithms.