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.

Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.

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

Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.

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

QuickBase - Quickbase provides a no-code operational agility platform that enables organizations to improve operations through real time insights and automation across complex processes and disparate systems. ​​