DBeaver - DBeaver - Universal Database Manager and SQL Client.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
FriendlyData - Communicate with databases like a human
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
SpreadsheetDB - A database that you can query with spreadsheets