TopCoder UML Tool

TopCoder UML Tool is a Windows software application designed to help you draw model sequence, class, use case, and activity diagrams. This is a Java-based utility so you need to deploy the environment on your computer.

User interface

You can work on different diagrams at the same time using the multi-tabbed layout. Each of the diagrams comes with support for different objects that can be used in order to define data.
The objects can be dragged from the left side of the working environment and dropped directly in the drawing area. You may resize the objects by dragging their edges and move them to the preferred position.

Diagram editing features

TopCoder UML Tool offers you the possibility to insert various types of connectors, embed nodes, as well as add text messages with custom color, font and size, shapes with user-defined background and border colors, and comments. You may connect comments to model elements.
The program lets you cut, copy, paste, delete or rename components, undo or redo your actions, use preset hotkeys for faster actions, zoom in or out of the diagram, and generate Java or C# code.
TopCoder UML Tool allows you to print or save the diagrams to GIF, BMP, JPEG, PNG, PNM, or TIFF file format, keep a list with all your recently edited diagrams, and move objects to the front or send them to the back.
The application does not eat up a lot of CPU and memory so the overall performance of the computer is not hampered.

Bottom line

All things considered, TopCoder UML Tool provides several handy features for helping you create diagrams. On the downside, the GUI cannot be described as highly intuitive so you may need extra time in order to get used to working with it.