Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
AppsGeyser - Appsgeyser is the easiest to use DIY native mobile app creation platform.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.