Together provides several features for data modeling and providing support for persistent objects.
Entity Relationship diagram provides both physical and logical schematic views
Presistent classes: you can mark a class as persistent using the Persistent property in the class Inspector. Select the class in a Class diagram and press Alt+Enter to launch the Inspector.
DDL generation for leading DBMSs from ER diagrams, EJBs, and persistent classes
JDBC round-trip engineering: data model to/from JDBC schema
Forward engineer ERD/EJB/Persistent class to Schema
Reverse engineer Schema to ERD/EJB/Persistent classes