Bouncy Castle

http://www.bouncycastle.org/

Encryption open source

graphviz

http://www.graphviz.org/About.php

It's a powerful tool to draw a graph.

Firefox copy-past setting-up

http://googlesystem.blogspot.com/2006/10/enabling-copy-paste-for-google-office.html

The method of configuring copy-paste of Firefox