Datahike - A durable datalog database adaptable for distribution.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
PlanetScale - The last database you'll ever need. Go from idea to IPO.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
Datomic - The fully transactional, cloud-ready, distributed database
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.