Open DBDiff - A database comparison tool for Microsoft SQL Server 2005+ that reports schema differences and...
DBeaver - DBeaver - Universal Database Manager and SQL Client.
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SQuirreL SQL - SQuirreL SQL is an open-source Java SQL Client program for any JDBC compliant database
TiCodeX SQL Schema Compare - SQL Schema Compare supports Database schema compare for MS-SQL, mySQL and Postgres and runs on Windows, Linux and MacOS
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.