DBeaver - DBeaver - Universal Database Manager and SQL Client.
Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
DataGrip - Tool for SQL and databases
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.