Parking in Florence can be stressful (at least for me) sometimes if you want to avoid entering the ZTL zones (a big fine for many tourists) while still negotiating Florence traffic. Google Maps does not help by default since it does not show the ZTL zones (as far as I could find).
However, ztlmaps (.com) for Florence overlays the ZTL zones on Google Maps and from there you can use Google Maps like usual. A lifesaver (or at least a 300 Euro fine saver) for me.
(For those that have asked... reviewed and approved)
Thanks for your advice, pburg.