Dataedo - Database documentation tool
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.
ApexSQL Doc - ApexSQL Doc creates database documentation in a variety of formats.
DbDesigner.net - DbDesigner is a web application which allows you to design your database schema without writing SQL.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Visual Alchemist - Open source web-based database diagramming and automation tool.