russells.freeshell.org/enigma/

This applet simulates the operation of the Enigma machine, used by Nazi Germany in WWII for encrypting communications. Source code is also available.

http://russells.freeshell.org/enigma/

www.nobleavatar.com

The Noble Avatar maker is an applet that allows you to create an avatar character and then export it to a PNG file for use in forums, games, IM applications etc. It apparently has over 15 trillion combinations of features, although I still couldn't get one to look much like me -:-)

http://www.nobleavatar.com/

javaboutique.internet.com/SpaceFlight/

The SpaceFlight applet simulates flying through space - you change direction by moving the mouse over the applet. It's a lot more impressive than that sounds, honestly.

http://javaboutique.internet.com/SpaceFlight/

mmcelhaney.blogspot.com/2008/10/iron-man-applet.html

This is a spinning cube, displaying a different image from the Iron Man movie on each side. Clicking on it stops it spinning, and moving the mouse around it changes the speed and direction of its rotation.

http://mmcelhaney.blogspot.com/2008/10/iron-man-applet.html

www.jigzone.com

An online jigsaw puzzle game, which lets you solve jigsaws of between 6 and 240+ pieces.

www.jigzone.com

http://java.freenode.net/index.php

An Open Source IRC chat applet that you can embed in your own website.


http://java.freenode.net/index.php?go=1

bfo.co.uk/products/pdf/viewer.jsp

This is an applet version of the pure Java PDF viewer component offered by BFO. It uses a signed applet, so once trusted it can open files from your local machine and display them inside the applet, including support for multi page navigation, zooming, JavaScript and document signatures.

http://bfo.co.uk/products/pdf/viewer.jsp

[Disclaimer: I've just started work at BFO ;-)]