jotp: The Java OTP Calculator

The sources to jotp:

• As individual files: jotp.java, otp.java, md.java, jotp.html, and CHANGES.
  or
• As a gzipped tar file: jotp1.0.tar.gz

A precompiled version:

• As a gzipped tar file: jotp1.0.class.tar.gz

For a page with this applet and some excess verbiage, look here.