TotalHotspots - Total Hotspots helps you find your ideal hotspots.
WiFi Map - A crowdsourced list of routers and passwords
Instabridge - Crowdsourced free wifi (now on Android)
Get Free Fucking WiFi - Find the best fucking WiFi just around the corner.
Wifi Locations - A community driven map for free or not free wifi locations.
OpenSignal - Mobile analytics and insights on wireless connectivity from Opensignal, the independent global standard for understanding the true state of the world's mobile network.