DBeaver
Free universal database tool and SQL client
Open source alternative to:
Similar open source alternatives
Beekeeper Studio
Modern and easy to use SQL client for MySQL, Postgres, SQLite, SQL Server, and more. Linux, MacOS, and Windows.
Alternative to: 
SQLPro Studio
SQLPro Studio
Baserow
Baserow is an open source no-code database and Airtable alternative. Create your own database without technical experience. Our user friendly no-code tool gives you the powers of a developer without leaving your browser.
Alternative to: 
Airtable
Airtable