Sequence Diagram Editor 1.6   
by Effexis Software, LLC   

Sequence Diagram Editor simplifies the creation and maintenance of UML sequence diagrams and call flows. It automatically takes care of layout and formatting (across multiple pages if needed) allowing you to easily create sequence diagrams much faster than with drawing programs or even generic UML tools. It supports additional drawing elements like states, actions, timers and scenarios. You can print diagrams directly or export to PDF/RTF.