Annuity / Morgage Calculator
This applet was my first calculational applet.  For presentation 
purposes, it has been updated with a small GUI.  The radio buttons at the bottom 
are used to choose the variable to calculate.  If there is not enough 
information to allow the calculation, the applet will note that on the 
Java console, set the requested variable to zero and revert to the waiting 
state.
The source (.java) and binary (.class) files are free for the taking.  Have fun.  
If you think of any unusual ways to use them drop me a 
line.