UMLet is an open-source UML editor with a light-weight, pop-up-free user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create custom UML elements.

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Visual Paradigm for UML (Community Edition) for Mac OS X

Visual Paradigm for UML is a full life-cycle UML CASE tool that supports the latest UML notation (class diagram, use case diagram, sequence diagram, communication diagram, state diagram, activity diagram, component diagram, deployment diagram).+MS Visio

Visual Paradigm for UML (Professional Edition) for Linux

Visual Paradigm for UML is an easy-to-use UML modeling tool that supports the latest UML notation (class diagram, use case diagram, sequence diagram, communication diagram, statechart diagram, activity diagram, component diagram, deployment diagram).+Round-trip engineering+Instant Reverse for XML, Dot NET dll/exe, C++, CORBA IDL+IDE Integration: Visual Studio .NET, IBM WebSphere, JBuilder, IntelliJ IDEA, Eclipse, NetBeans, Sun ONE+more

Cadifra UML Editor

Cadifra UML Editor is a fast and lightweight UML diagram editor for Windows 2000 and XP. Can embed diagrams in Microsoft Word (and others). Unlimited undo/redo. Implements full Windows Drag&Drop. Produces high quality diagrams. No Code Generation.

microOLAP Database Designer for PostgreSQL

Visual development system intended for database design, modeling, creation, modification and reverse engineering in an easy and powerful way. Accelerates the process of PostgreSQL database creation and makes it clear.

Trace Modeler for UML Sequence Diagrams

Trace Modeler is an easy to use and smart editor for UML sequence diagrams... It instantly updates the diagram layout, freeing you to focus on the actual content... Ideal for documenting existing systems and brainstorming new designs.. And fast too!

Hertzsprung - Russell Diagram

This software is based on famous Hertzsprung - Russell [H-R] diagram in stellar astronomy.

SDE for Sun ONE (CE)

SDE for Sun ONE is a UML CASE tool totally integrated with Sun ONE. You can draw UML diagrams in Sun ONE, generate Java code, reverse engineering Java code to class diagrams and generate documentation.

DiagramStudio

Diagram Studio is a tool for creating flowcharts, business and technical diagrams. Draw objects, various shapes and link them together. The program features user-controlled points of connection, color shadows, graphics import and export, curves.

SDE for WebSphere (CE)

SDE for WebSphere is a UML CASE tool totally integrated with WebSphere. You can draw UML diagrams in WebSphere, generate Java code, reverse engineering Java code to class diagrams and generate documentation.

SDE for NetBeans (CE)

SDE for NetBeans is a UML CASE tool totally integrated with NetBeans. You can draw UML diagrams in NetBeans, generate Java code, reverse engineering Java code to class diagrams and generate documentation.