Agilian is an agile modeler, which provide the following features:
Full UML 2.1 support
Business Process Modeling with BPMN
Database Modeling with ERD
Team operation capability with Teamwork Server, CVS, SVN & Perforce
Agilian is aimed to provide complete modeling tool set which you needed in developing systems. You can model different aspect of the system within a single tool. More details about Agilian can be found at Agilian Product Page.