I thought I'd just add some info, as a long term user of the Eclipse framework.
If you want to add some extra tools to your Flash Builder, goto Help > Install New Software... and in the dialog click on Available Software Sites.
In the next dialog Add.. a site with any name you want and the URL: http://download.eclipse.org/releases/galileo
Once added, a Pending... notice will appear while the avalable downloads cache file is implemented, then you can select the site from the drop down above where it said "Pending..." and you will see a plethora of tools for all kinds of things.
Hope you find something useful in there.
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