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MySQL - The world's most popular open source database
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.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
usql - Universal command-line interface for SQL databases
SQLite - SQLite Home Page
Opbeat - Application monitoring for developers