phpMyAdmin - phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Valentina Studio - FREE native database manager for SQLite, MySQL, PostgreSQL, SQL Server and Valentina DB.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
SQLite Manager - Manage all your SQLite databases using this lightweight extension for Firefox, Thunderbird...
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.