If you have an existing uml activity that needs to be modeled, Edraw is recommended as the ideal software. Get started with the basic vector shape conventions, including activities, state, control flow, swimlane, initial state, synchronization bars. Then document the uml activity with simple formatting and connecting of the shapes.
Free download UML diagram templates in the professional content sharing community. With Edraw Max, you can edit and print the free UML diagram template for personal and commercial use.