MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Brilliant Database - Create a personal or business desktop database fast and easily using this simple all-in-one database software. Free 30 day trial.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
CouchBase - Document-Oriented NoSQL Database
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.