LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Claris FileMaker - Claris FileMaker is a platform that allows users to build apps like a boss, and it helps in enhancing their digitization of work.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Symphytum - Symphytum Project
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
4D - 4D is a relational database management system and IDE.