Navicat Data Modeler - Navicat Data Modeler allows users to create a conceptual model from an existing database and edit the structure of the database easily.
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
DbDesigner.net - DbDesigner is a web application which allows you to design your database schema without writing SQL.
ApexSQL Doc - ApexSQL Doc creates database documentation in a variety of formats.
WWW SQL Designer - Create database designs, which can be saved/loaded and exported to SQL scripts.
DBeaver - DBeaver - Universal Database Manager and SQL Client.