Database diagram / Reverse Engineering tools
List of database ER diagram (ERD) / schema visualization / reverse engineering tools for popular databases.
The Aqua Data Studio Entity Relationship Modeler (ER Modeler) helps you design physical database models for all major RDBMS vendors and versions. An ER diagram can be extracted from an existing database and its schema objects displayed as a model by using Tools->ER Diagram Generator in the Server Browser.
Visual Paradigm supports reverse engineering ERD from existing database. By visualizing a database schema in ERD, you can re-edit it and patch changes back to the database, or you can produce a data specification that acts as a reference for programmers who need to access the database.
Jeddict is an open source development platform that simplifies development tasks of creating complex entity relationship models. It provides forward & reverse engineering capabilities, import models from existing database, generate complex SQL/DDL, and much more. Make it available again by importing the existing database and create new ER diagram.
SQL Power Architect data modeling tool has many unique features geared specifically for the data warehouse architect. It allows users to reverse-engineer existing databases, perform data profiling on source databases and auto-generate ETL metadata.