DbVisualizer is a feature-rich, intuitive, cross-platform database tool for developers and DBA's providing a single powerful interface for a variety of databases. DbVisualizer supports simultaneous database connections; it lets you explore and manage database objects, execute SQL queries, visualize information, and a lot more. Free of charge for commercial and non-commercial use. This edition provides basic level features useful for most users.
DbVisualizer comes in Free and Pro editions. You can find the differences here . The price quoted in the listing is the starting price for the Pro edition.
Full list of changes available here.