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ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It runs on any Java platform and is available in ten languages.
ArgoUML was installed half a million times during 2005 and is in use all over the world.
The Eclipse Graphical Modeling Framework (GMF) provides a generative component and runtime infrastructure for developing graphical editors based on EMF and GEF. The project aims to provide these components, in addition to exemplary tools for select domain models which illustrate its capabilities.
StarUML is an open source project to develop fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform. The goal of the StarUML project is to build a software modeling tool and also platform that is a compelling replacement of commercial UML tools such as Rational Rose, Together and so on.
Gaphor is a UML modelling tool written in Python. Gaphor is designed to be lean and extensible.
It uses the GTK+ environment for user interaction.
TinyUML is a graphical editor application to create UML 2 diagrams.The project's focus is on providing a small tool which runs on a large number of platforms, enables the user to draw attractive diagrams and is easy to use.
EasyDiagram.NET is a self-enclosed ASP.NET 2.0 Diagramming component that is built entirely in C#. It uses AJAX methods for node drawing and node repositioning, and boasts an incredibly responsive redrawing engine without the need for any plugins
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(such as Flash, etc). A variety of events (such as OnNodeRepositioned, OnNodeDoubleClicked) can be hooked into to ensure seamless server-side integration.
UML (class diagramming), Geneology, flowcharting -- virtually any diagram is possible because the node image and text can be set dynamically.
Both orthogonal and direct-line diagramming is possible, and the component is a draggable from your toolbox onto the webform. [Less]