DBeaver - DBeaver - Universal Database Manager and SQL Client.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Sequel Pro - MySQL database management for Mac OS X
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.