Open Source Database Management Systems (DBMS)

SQuirreL SQL Client is a graphical SQL client written in Java that will allow you to view the structure of a JDBC compliant database, browse the data in tables, issue SQL commands etc.

MyWebSQL is a web based WYSIWYG Database client written in PHP. It has a simple and intuitive interface with the look and feel of a desktop application, and offers rich features for database management. No installation is needed, just download, extract and you are ready to go. It even has a single file compact version with full functionality, which you can quickly deploy on your server. Currently MyWebSQL supports working with MySQL, PostgreSQL and SQLite databases.

Eclipse SQL Client for database querying/browsing any JDBC compliant database. It supports plugins with specialized functionality for individual databases (Oracle, DB2, MySQL, PostgreSQL, Sybase, Informix) and can be extended.

MongOz is a MongoDB client, intended to be multi-platform. It's written in Java as backend (to handle the MongoDB connections) and Javascript / HTML5 / CSS3 as frontend, in order to have a modern interface, besides being easy to change as desired.

Zora is an open-source automated testing framework designed specifically for testing database functionalities. It supports multiple database management systems including MySQL, PostgreSQL, and MongoDB. The framework provides a comprehensive suite of tests to ensure data integrity, reliability, and performance across different database types.