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.
An Java JDBC compliant driver that connects to a remote database via url (http) connection, communicating through a server-side script (.asp,.php,.jsf etc). Useful if you like to access locally (java, SQuirreL, eclipse) a database on your web site.