LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...

ESM Tools - ESM Tools is a powerful and widely known software development platform that comes with a centralized model infrastructure, providing the common frame for compiling, running, downloading, and organizing models (ones or multiple).

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.

Amazon RDS - Easy to manage relational databases optimized for total cost of ownership.

MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.