If your browser is Java enabled (needs Swing plugin) then the plot filter applet should appear below. It is a work in progress so if a feature is missing, maybe it will appear in the future.You can try the Java 1.4 download page for a full set of download options or the "Get Java Technology" page for a quick plugin download.
This code borrows heavily from mkfilter and has been rewritten in Java. It uses the ptplot package for the graphics.
The use of this applet is intended only for educational purposes and no warranty, expressed nor implied, is given. Ie use it at your own risk.
Some known issues: