ArgoUML - UML modeling tool

•    Java

ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It supports Class diagram, Statechart diagram, Activity diagram, Use Case diagram, Collaboration diagram, Deployment diagram and Sequence diagram. The diagram could be exported to GIF, PNG, PS, EPS, PGML and SVG. It generates code for Java, C++, C# and PHP. It also supports reverse engineering, generates code from diagram.

ModelGoon - UML for Java

•    Java

ModelGoon provides support to create UML diagram from Java source. It provides support to build packages dependencies diagram, Class Diagram from existing sources, Build Sequence Diagram from a Java method, Shows the dependencies between user selected packages and lot more. ModelGoon is not a UML modeler, but just an UML point of view above the Java source code. It still uses UMLet for drawing purpose and the Eclipse Modeling Tools for implementing full MDA platforms.

gaphor - Gaphor is the simple modeling tool

•    Python

Gaphor is a UML and SysML modeling application written in Python. It is designed to be easy to use, while still being powerful. Gaphor implements a fully-compliant UML 2 data model, so it is much more than a picture drawing tool. You can use Gaphor to quickly visualize different aspects of a system as well as create complete, highly complex models. Gaphor is a UML and SysML modeling application written in Python. We designed it to be easy to use, while still being powerful. Gaphor implements a fully-compliant UML 2 data model, so it is much more than a picture drawing tool. You can use Gaphor to quickly visualize different aspects of a system as well as create complete, highly complex models.

topcoder-UML-Tool - We're proud to introduce the TopCoder UML Tool: An easy to use, consistent modeling tool for use in Design and Development competitions

•    Java

We're proud to introduce the TopCoder UML Tool: An easy to use, consistent modeling tool for use in Design and Development competitions. The new tool was designed and developed entirely by the TopCoder Community to model sequence, class, use case, and activity diagrams. On top of that, all those elements can have documentation easily attached to them. Make sure the machine you are installing on has the proper version of Java (1.7).

Tobago MDA Generator

The flexible and extensible Tobago MDA Generator uses UML models from any UML modeling tool, and produces files according to defined patterns. The Tobago MDA Generator is one of the accelerators of the ADP (www.accelerateddeliveryplatform.com)

UMLGraph - Automated Drawing of UML Diagrams

•    Java

UMLGraph allows the declarative specification and drawing of UML class and sequence diagrams. The current features are part of an ongoing effort aiming to provide support for all types UML diagrams. Running the UmlGraph doclet on the specification will generate a Graphviz diagram specification that can be automatically processed to create Postscript, GIF, SVG, JPEG, fig, or Framemaker drawings.

StarUML

•    Delphi

StarUML is an open source project to develop fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform. The goal is a compelling replacement of commercial UML tools such as RationalRose, Together and so on.

Lexakai - A tool for generating UML diagrams and markdown documentation indexes

•    Java

Lexakai is a command line tool used to create UML diagrams and markdown documentation indexes. It creates and updates UML diagrams and README.md documentation indexes from the source code of each maven project discovered recursively from the root folder(s) given as argument(s).

nomnoml - The sassy UML diagram renderer

•    Javascript

Hello, this is nomnoml, a tool for drawing UML diagrams based on a simple syntax. It tries to keep its syntax visually as close as possible to the generated UML diagram without resorting to ASCII drawings. Created by Daniel Kallin. Contributions by Alexander Moosbrugger and korroz.

Taylor

•    Java

Taylor MDA is a specialized UML modeling tool based on Eclipse. It uses convention-based techniques to generate the maximum code from streamlined UML models. Templates are included for generating JEE applications based on JPA/EJB3 and JSF/Seam/Facelets.

Taylor

•    Java

Taylor MDA is a specialized UML modeling tool based on Eclipse. It uses convention-based techniques to generate the maximum code from streamlined UML models. Templates are included for generating JEE applications based on JPA/EJB3 and JSF/Seam/Facelets.

Green - Create UML diagram from code

•    Java

green is a LIVE round-tripping editor, meaning that it supports both software engineering and reverse engineering. You can use green to create a UML class diagram from code, or to generate code by drawing a class diagram. green supports exporting files to both jpg and gif format, so that you can share you diagrams without any issues!

Dia - Visio alternative

•    GTK+

Dia is inspired by the commercial Windows program Visio, though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.

Witchcraft - the next generation MDA

•    Java

An MDA(model driven architecture) tool to generate a complete web / mobile app from a UML model. Will generate high quality , best practices compliant code from UML model for all tiers of an enterprise application i.e. presentation, persistence, plumbing

Frame UML

•    Javascript

A free UML tool. 1)Support UML 2.xx; 2)Used in Windows(2000/XP/Vista); 3)Can generate source code /CHM from model, or parse source code into model by JavaScript; 4)Support 12 kinds of diagram except object diagram; 5)Very nice, simple, and easy to use.

jdl-studio - JDL Studio is an online JHipster Domain Language visual editor

•    Javascript

Hello, this is JDL-Studio, an online tool for drawing UML diagrams for JHipster based on the JDL syntax. It tries to keep its syntax visually as close as possible to the generated UML diagram without resorting to ASCII drawings. The JDL-Studio web application is a simple editor with a live preview. It is purely client side and changes are saved to the browser's localStorage, so your diagram should be here the next time, (but no guarantees).

XCase - Tool for XML Data Modeling

•    DotNet

XCase is a case tool for conceptual modeling of XML data based on MDA as it separates the conceptual modeling process to two levels: Platform-Independent and Platform-Specific Model. From each PSM diagram you can derive an XML schema describing a data view.

KangaModeling

•    DotNet

KangaModeling allows you to produce UML (like) diagrams very easily. The main idea is to generate the diagram from lightweight markup textual diagram description language. KangaModeling is made for those who think that full-fledged modeling tools are overdesigned for visua...

UML-Designer - OpenSource (EPL licensed) UML2 Graphical Modelers (Class, Composite, State, Activity, Sequence

•    Java

UML Designer provides a set of common diagrams to work with UML 2.5 models. The intent is to provide an easy way to make the transition from UML to domain specific modeling. This way users can continue to manipulate legacy UML models and start working with DSL. Users can even re-use the provided representations and work in a total transparence on both UML and DSL models at the same time. These plugins are released under the EPL Open-Source License.

uml2svg

uml2svg is a tool for converting UML diagrams into SVG. The diagrams have to conform with the UML Diagram Interchange 1.0 Specification, which at this time means they have be exported by Poseidon for UML.