CellID Finder - Find a cell phone location using LAC/CellID, GSM BTS coordinates
Cell Signal Monitor - Cell Signal Monitor is an advanced network monitor that helps you to watch the state of cellular network by gathering data about cell towers. The app supports GSM, UMTS and LTE networks. There is a Free edition with adds.
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!
NetMonster - NetMonster is a networking app by Michal Mrocek that comes up with features to enable you to get detailed information about your current network right on your mobile phone screen.
wigle.net - WiGLE (Wireless Geographic Logging Engine)
NetMonitor Cell Signal Logging - NetMonitor Cell Signal Logging app helps you in receiving accurate measurements of the speed of the internet and the strength of signals to choose the correct network according to your needs.