Sequence Diagram Editor sdedit

1)
http://sdedit.sourceforge.net/example/index.html

2)
Download
http://sourceforge.net/projects/sdedit/files/
http://liquidtelecom.dl.sourceforge.net/project/sdedit/sdedit/4.2/sdedit-4.2-beta1.jar

3)
Run
$java -jar sdedit-4.2-beta1.jar