Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Kajero - Interactive JavaScript notebooks - create good-looking, responsive, interactive documents.
DataGrip - Tool for SQL and databases
BeakerX - Open Source Polyglot Data Science Tool
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.