Jiwire Wi-Fi Finder - JiWire's Global FREE Wi-Fi app uses your iPhone's GPS and network triangulation capabilities to...
CellID Finder - Find a cell phone location using LAC/CellID, GSM BTS coordinates
Instabridge - Crowdsourced free wifi (now on Android)
OpenCellID - OpenCelliD is the largest Open Database of Cell Towers & their locations. You can geolocate IoT & Mobile devices without GPS, explore Mobile Operator coverage and more!
Wifi Locations - A community driven map for free or not free wifi locations.
wigle.net - WiGLE (Wireless Geographic Logging Engine)