CIS-C0 / RFSentinel

RF Sentinel (RFSentinel): free, open-source police detector app for Android. Spots police body cams, Flock ALPR cameras, AirTag trackers, Remote ID drones, smart glasses and fake cell towers from Bluetooth LE and WiFi. No root.

agamrossen / VolAnti

Open-source acoustic drone detection. It hears the propellers, not the radio, so it works against fibre-optic FPV aircraft that emit no signal at all.