Object Management Group (OMG) provides the newest UML standards, add-ons and features on their site.

Collection of links; includes other links on objects and components.

The Unified Modeling Language industry-standard for specifying, visualizing, constructing, and documenting the artifacts of software systems. By Rational Software Corporation.

xtUML is a model-driven development process based on industry-standard UML notations. xtUML models are executed and tested early in the development lifecycle and are translated to generate optimized target code.

Publications, events, mailing list, links and organization; working on the evolution and standardization of the Unified Modeling Language.

Covers recent developments in object-oriented design and programming. Includes list of books, UML modeling tools, projects and forums.

Contains references to publications and links about the Unified Modeling Language.

Specialized in consultancy and training in UML, OCL, Unified Modeling language, Object Constraint Language, object technology and component based development.

An Open Directory for Unified Modeling Language community (Powered by Visual Paradigm).

Links on Free Object Oriented Unified Modeling Language tools, links, and resources.