Today I installed TOra.
Its a QT app thats free for linux and provides power and fairly easy management and interactivity with Oracle, MySQL, Postgres, etc.
It looks like TOAD and feels a lot like it (from what I have done so far) but works with other databases.
Nice!
The only thing that has seriously annoyed me so far is how long it takes to list all of the views in the schema browser. With TOAD it's instantaneous, but TORA actually takes about 2 minutes to list them all (we have a LOT of views here).