Mapstr - Your places, your world!
WiFi Map - A crowdsourced list of routers and passwords
Café Wifi Search 🔍 - Find great cafés to work from, worldwide.
Maptia - Explore and contribute to a world of stories
Instabridge - Crowdsourced free wifi (now on Android)
GeoMark.info - GeoMark - Your Personal Location Data Bank