Source Code
The source code for the plugin is hosted at sourceforge.net. You can access it via the web here, or check it out with Subversion from:
svn://svn.code.sf.net/p/portecoulissant/code/trunk
The code is in the form of a Maven project, which you can build directly using Maven itself, or open with an IDE which supports Maven, such as Netbeans.
Note that the code is open source, licensed with the GNU General Public License, version 3. This means that you are free to use it and modify it, but if you redistribute it (unchanged or modified) you must do so as open source under the GPL too!