The UML® is owned by the Object Management Group (OMG) , which maintains a site that contains useful introductory information about the standard and how it is being updated for future implementation. The OMG also provides a list of lists of processes and tools
DOORS® is a widely used and portable requirements management tool.
Rational® Clear Case® and Rational® Clear Quest® : for change management and version control
Rhapsody® is a high quality tool produced by IBM® Rational®, which generates significant amounts of executable code from UML models.
Rational® Test RealTime is a high quality tool produced by IBM® Rational® for test management and code analysis.
The following links are to lists that provide information about a wider variety of products on the market supporting software engineering: