Log4E is an Eclipse Plugin which helps you to set up your logger easily in Java Projects. It assists you in several tasks: logger declaration, logger Insertions at certain method entries, substitution of System out's, modification of already existing logger statements.

AmaterasUML

AmaterasUML is an Eclipse plug-in for drawing UML which supports class-diagram, sequence-diagram and usecase-diagram. And it also provides Java support such as importing class/interfaces from Eclipse workspace and exporting class-diagram to Java source code.

UMLet - UML Tool for Fast UML Diagrams

The free UML tool UMLet lets you draw UML diagrams with a light-weight, pop-up-free user interface. It lets you draw diagram sketches fast; export diagrams to pdf, eps, jpg, gif, svg, bmp, png, and system clipboard; share diagrams using Eclipse 3+; and create your own custom graphical elements.