Dataedo - Database documentation tool
DBeaver - DBeaver - Universal Database Manager and SQL Client.
SQuirreL SQL - SQuirreL SQL is an open-source Java SQL Client program for any JDBC compliant database
ApexSQL Doc - ApexSQL Doc creates database documentation in a variety of formats.
DBComparer - Free Compare database tool - DBComparer 3.0 is a professional compare database tool for comparing Microsoft SQL Server 2008 (and 2005) database structure.
DbSchema - DbSchema - Visual Database Design & Management Tool