LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Flagsmith - Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
ClearFlask - Open-source Product Feedback Tool with a Public Roadmap and Announcements.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Symphytum - Symphytum Project