DBeaver - DBeaver - Universal Database Manager and SQL Client.
Sesame Database Manager - Lantica Software, LLC - Sesame, A Q&A-compatible Database Manager.
DataGrip - Tool for SQL and databases
Sheep - Membership and events for SMEs and nonprofits
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
CentriQS - CentriQS offers small business management software and custom database solutions for small and medium enterprise businesses.