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usql - Universal command-line interface for SQL databases
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Rollbar - Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them. Ruby, Python, PHP, Node.js, JavaScript, and Flash libraries available.
DataGrip - Tool for SQL and databases
Opbeat - Application monitoring for developers
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.