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Dragonfly is Opera’s answer to Firebug. I’m sure browser vendors are sick of the comparisons, but Firebug was the first high-usage developer console and, in my opinion, it’s still the best.
That said, Dragonfly is very good. It offers a familiar set of features such as:

Package:
connector
Summary:
Execute MySQL prepared queries
Groups:
Databases, PHP 5
Author:
Muralikrishna Srinivasan
Description:
This class can be used to execute MySQL prepared queries.

Package:
Binary Tree Representation
Summary:
Display the nodes of a tree in a MySQL database
Groups:
Databases, HTML
Author:
vijay
Description:
This class can be used to display the nodes of a tree in a