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.
CellID Finder - Find a cell phone location using LAC/CellID, GSM BTS coordinates
SnoopSnitch - Collects and analyses mobile radio data to make you aware of your mobile network security and to...
openBmap - Open source alternative for crowsourced cell tower and wifi data
GSM Spy Finder - Detect IMSI/IMEI/TMSI catchers and interception of voice and data over GSM networks
wigle.net - WiGLE (Wireless Geographic Logging Engine)