4D - 4D is a relational database management system and IDE.
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.
ApexSQL - ApexSQL is a complete suite of tools intended for SQL servers for DBAs and developers that streamlines and automates SQL Server database management and development processes.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.