Favorite Eclipse UML Plugin

What is your favorite Free or Open-Source UML Plug-in?

Every year i try some of them and  remove them after few hours. As i remember, they where resource-hungry or just bad in reverse engineering

Some weeks ago i tried ObjectAid UML Explorer Class Diagram and liked it. It could quick and easy create simple class Diagrams - just by Drag & Drop. And i had no problems with static constructors or inner classes and other stuff in the code which causes problems to another Plug-ins.

Unfortunately Object Aid Sequence Diagram are not free but cost not much for private usage. Maybe i'll try it soon.

But first i would ask you what is your favorite Eclipse IDE Plug-in for fast and easy (e.g. partly) revers engineered UML diagrams which can be used to show some architectural details to your colleagues?

Thank you for comments!