Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
PortaBase - PortaBase (portable database) is a program for conveniently managing one-table database files.
SnapDB - Simple, flat-file database/list app.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.