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.

Ostorlab - Ostorlab scans your web or mobile application and provides results showing threats and privacy issues.

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!

Traced for Android - Traced is a free cybersecurity app for Android. It detects suspicious activity from apps and unsecured Wi-Fi connections that might be used to spy on you or invade your privacy.

wigle.net - WiGLE (Wireless Geographic Logging Engine)

App-Ray - App-Ray provides a cutting-edge solution for you to conduct a system-wide analysis and detect vulnerabilities in your mobile applications.