Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
GoodBarber - GoodBarber is a mobile app creation platform.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Bizness Apps - Create your own app or become a reseller and build apps for others
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.