Action Semantics Consortium - The action semantics for the UML support precise executable specifications of systems and enable the translation of models into one of several possible designs. www.umlactionsemantics.org
Hierarchical Object-Oriented Analysis - HOORA describes a pragmatic way of using UML. It defines several consistent views to be created while modeling: static model, dynamic model, package summary. By E2S nv. www.hoora.org
OOHCI Methods for Interactive Systems Design - This site documents methods that integrate UML with human-computer interaction design techniques for analysis-level design of interactive systems. www.oohci.org
UML Methodology - Draft of a book that attempts to provide a methodology to use Unified Modeling Language in software systems development. umlmethod.freeservers.com