[ excerpt from developer's www site with modifications ]

Hibernate Tools is an entirely new toolset for Hibernate3 implemented
as an integrated suite of Eclipse plugins, together with a unified
Ant task for integration into the build cycle. The following features
are available:

+ Mapping Editor: An editor for Hibernate XML mapping files
+ Console: Allows you to configure database connections, provides
  visualization of classes and their relationships and allows you
  to execute HQL queries interactively against your database and
  browse the query results.
+ Reverse Engineering: Database reverse engineering tool that can
  generate domain model classes and Hibernate mapping files, annotated
  EJB3 entity beans, HTML documentation or even an entire JBoss
  Seam application in seconds!
+ Wizards
+ Ant task

WWW: http://www.hibernate.org/