IBM Rational offers a number of architecture and design products that automate the practice of applying the UML.
Rational products and UML
IBM Rational® Rhapsody® family
A family of model-driven development tools for systems and embedded software using SysML, UML, DDS, UPDM targeting C, C++, Java™, C# and Ada applications.
IBM Rational Software Architect family
A family of model-driven development tools for corporate IT, SOA, and general development, supporting Java, JEE, C++, .NET, SCA, Web 2.0, and more.
IBM Rational Modeler
A free, UML-based software design tool created by one of the founders of Unified Modeling Language.
IBM Rational Rose® family
A family of visual modeling tools leveraging UML for software and systems design.
Analyze system safety using UML
Learn developers and analysts capture safety-related requirements, to perform fault tree analysis to create designs that meet those safety concerns.
Using models to design business processes and services
Learn the value of designing your business processes and services with UML
Collaborative design with Rational Rhapsody Design (YouTube, 00:07:46)
See how design management improves team collaboration