Data modeling tools

List of data modeling and database design tools.

Database design tools

List of tools that allow for the design of a database.

Database diagram / Reverse Engineering tools

List of database ER diagram (ERD) / schema visualization / reverse engineering tools for popular databases.

Schema compare tools

List of database schema compare and synchronization tools.

Version control tools

List of source version control tools for databases.
State-based tools - generate the scripts for database upgrade by comparing database structure to the model (etalon).
Migration-based tools - help/assist creation of migration scripts for moving database from one version to next.