ModelGoon brings the power of visual models in a Java development. It is intended for developers during implementation activities. ModelGoon provides actually three diagram which are built directly from the java sources.

OntoUML Editor is a model-based graphical editor that supports the creation of conceptual models and domain ontologies in a philosophically and cognitively well-founded modeling language named OntoUML, which is based on the foundational ontology UFO. The editor is designed in a way that, on one hand, it shields the user from the complexity of the ontological principles underlying this language. On the other hand, it reinforces these principles in the produced models by providing a mechanism for automatic formal constraint verification.

UML StateWizard acts as an IDE (Integrated Development Environment) add-in, which provides a UML (Unified Modeling Language) state machine programming mechanism in form of portable standard C or C++ classes for either embedded systems development and simulation, or Linux/Windows/WinCE application development. After embedded systems' simulation and debugging in IDE, developer can move program to a destination working environment (such as VxWorks, embedded Linux, etc) with little or no extra investment of effort.

PlantUML is an open source tool that allows to quickly write all Unified Modeling Language (UML) diagrams: sequence diagram, use case diagram, class diagram, etc.

WUml is an easy to use lightweight UML-Editor for educational purpose.

Umple is a programming language family. It adds abstractions such as Associations and Attributes derived from UML to object-oriented programming languages such as Java and PHP. Umple can also be used to create UML class diagrams textually.

The goal of the project is to build a platform-independent UML modeling library for text-to-diagram translation. The domain-specific scripting language used by the core library is designed for simplicity of diagram sketching.

Archi is a free, open source, cross-platform tool to create ArchiMate models. ArchiMate1 is an open and independent Enterprise Architecture modelling language that supports the description, analysis and visualization of architecture within and across business domains.

UML Lab is the first Modeling IDE to seamlessly combine modeling and programming with an intuitive class diagram editor and next-gen round-trip engineering (Round-Trip-Engineering NG). It recognizes Java legacy code and keeps your models clean and free from implementation details. This flexibility is achieved by using the same customizable Xpand Templates for forward and reverse engineering.

Overture is a community-based project developing the next generation of open-source tools to support modelling and analysis in the design of computer-based systems. Overture supports VDM: The Vienna Development Method, a set of modelling techniques with a long and successful history of industrial application and research. Overture is an integrated development environment (IDE) for developing VDM models. The Overture tools are written entirely in Java and build on top of the Eclipse platform.