LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
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.
Informix - IBM Informix is a secure embeddable database optimized for OLTP and IoT data. Informix can seamlessly integrate SQL, NoSQL/JSON, and time series and spatial data.
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).
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
H2 Database - H2 is free SQL database written in Java