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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.
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.
JspMyAdmin 2 - A Java Web tool for MySql database administration
JspMyAdmin 2 is the software for MySql database administration over Web. It provides a user friendly design to manage most of the MySql database administration. Create and Manage database objects (Databse, Table, View etc..) with simple mouse clicks.
Quantum is a database plugin for Eclipse (needs GEF, Point Eclipse at http://quantum.sourceforge.net/update-site). It currently supports most databases with a JDBC driver. It shows tables, views, and sequences in a tree format and provides an SQL editor
Vela is a Open Source SQL and PL/SQL client software for Oracle database with a graphical user interface developed using Java Swing. It is a Front-End tool for a Oracle developer. It supports most of the common developer tasks.
Currently dead. Web-based SQL client that can connect to any number of databases using JDBC. Provides a clean, simple and fast interface using HTML and Javascript to make it very easy to run common SQL queries. Faster than your average Swing-based client
Eclipse SQL plug-in. Contains SQL editor and executor. Table editor, data retrieve and migration tools. Plug-in has extensions to be used in other projects that need database connectivity.
DB Copy Plugin is a plugin for the SQuirreL SQL Client (1.2beta6 and 2.0 RC1+) that allows copying database objects (schema def and data) from one session window to another. The sessions can be disparate database vendors (Oracle -> MySQL, for instance).
Lightweight SQL querying tool written in Java. Connects to any JDBC compliant database and will run on any OS with a Java VM. Features: keyword highlighting, result formatting, statement history, multi-window, multiple database connects at one time.
DBPad is a GUI-based SQL client for relational databases. As long as you have a JDBC driver for your DB, you can use DBPad to view or manipulate your data and metadata of your tables.
JSQL Edit is a database-independent SQL client that allows graphical manipulation for making queries to databases. JSQL Edit is written in Java and uses JDBC for connectivity and Java Swing for a graphical user interface.
ProDBA The cross platform Oracle development/administration tool written in Java. Features a powerful SQL editor and schema navigator. Can export dynamic queries to the web.
ViennaSQL is a GUI SQL client written in 100% Java. ViennaSQL can communicate with any database that has a JDBC driver. It should run anywhere Java runs.