Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Knack - Knack is the easiest, most spectacular business management software available.
DataGrip - Tool for SQL and databases
Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.