Add the locations of free WiFi hotspots as POIs to your TomTom! Simply download the zipfile for your TomTom map, unzip it, and copy the files to the corresponding TomTom map folder. Each zipfile contains two files, a .ov2 containing the POIs and a .bmp containing the icon that will be displayed on your TomTom map.
After placing the files in the map folder, start TomTom. You should now have a new POI category called "Hotspot".
Do note, I don't take responsibility for the information provided here being correct or complete. In case there is interest in making these files for other European countries, let me know.
If you like the free hotspots POIs, you can make a donation to buy me a beer or two through PayPal or credit card by using the button below. Just pay whatever you think is reasonable.