OpenSignal!

Radiocells.org is a community project to collect informations on cell tower and wifi base stations and bring them on a map.The project itself was founded in 2009, then under the name openbmap.org.

Sensorly develops products and services to help operators improve their network quality. With thousands of users measuring signal quality around the world everyday, we have a unique perspective on network experience as perceived by real life users.

Service that provides huge database which transforms mobile towers IDs to GPS coordinates

Find a cell phone location using LAC/CellID, GSM BTS coordinates

Mozilla is a nonprofit project and global community building a better internet. Mozilla Stumbler is an open-source wireless network scanner that collects GPS data for the Mozilla Location Service, our crowd-sourced location database. As you move around, the app "stumbles" upon new Wi-Fi networks and cell towers. The Mozilla Location Service combines these wireless network measurements to provide geolocation services for Firefox OS devices and other open source projects. For more information, visit our project page:• https://location.services.mozilla.com »

The GSM Security Map at gsmmap.org compares the protection capabilities of mobile networks. This app collects data and adds it to GSM Map.This application currently only works on Android 4.1.2 Samsung S2 and S3 devices and requires root priviliges during the mobile network data capture.

Cellumap is a revolution in cellular coverage maps, in that the coverage maps here are not created by the network operators, but rather by the users of the network (ie: you!). The coverage maps that are given publicly by the network operators are usually very high-level (ie: not very detailed, no signal strength info) and become quickly out-of-date as the network changes almost daily. Cellumap allows people to plot accurate points (using GPS) and with actual recorded signal strength (and other information) in real-time! Your privacy is also guaranteed, as there is no phone number or account info ever recorded or displayed. »

Track down a GSM/WCDMA cell phone online using LAC (Location Area Code) and Cell ID ,track down a CDMA/CDMA2000 cell phone online using SID,NID and BID, and display its location on Google Maps.

A free service from Meshable.io, getWi.Fi provides a very intuitive and interactive world map plus search feature that lets you easily locate public wi-fi hotspots around the world.