I use this mostly for browsing databases and for certain specific monitoring processes. Like monitoring a database restore/recovery where the time SQL executions and real-time graphs are a great help estimating the time left.

I use DbVisualizer to run complex queries in many databases, including about every vendor with a relational database.

Timed SQL execution and real-time graphs are the killer features. It is a multiple-platform tool, based on Java but with a native look and feel. Most colleagues initially don't believe it is entirely written in Java.

For Oracle, I use it to analyze AWR data.

During database restores, I use this to monitor the progression and to estimate the remaining time.

The limits to its use are by imagination only.