Download
To download the library, the best is to use the download page of the project hosted on sourceforge.
To use it, simply add it to the classpath of your project.
You can also get the last development version from the subversion repository.
You need subversion to be installed on your system. The command line is:
svn co https://geom-java.svn.sourceforge.net/svnroot/geom-java/trunk .