Backends

Network-Location

• AppleWifiNlpBackend - Uses Apple's service to resolve Wi-Fi locations. It has excellent coverage but the database is proprietary.
• AMap UnifiedNlp Backend - Uses the AMap Location API (a popular location service in China) to resolve locations. The database is proprietary.
• Baidu UnifiedNlp Backend - Uses the Baidu Location API (another popular location service in China) to resolve locations. The database is proprietary.
• Déjà Vu Location Service - Uses locally acquired WLAN/WiFi AP and mobile/cellular tower data to resolve user location.
• LocalWifiNlpBackend - Local location provider for Wi-Fi APs using on-phone generated database.
• LocalGSMLocationProvider - Local opencellid based location provider backend. Has been surpassed by LocalGSMBackend which also has an OpenCellID option - Last update in 2014
• LocalGSMBackend - Local location provider for GSM cells. It works offline by downloading freely licensed database files from Mozilla, OpenCellID, or lacells.db.
• MozillaNlpBackend - Uses the Mozilla Location Service to resolve user location. The coverage is OK. Only the cell tower database is free.
• OpenWlanMapNlpBackend - Uses OpenWlanMap.org to resolve user location but the NLP backend did not reach release-quality, yet. Users interested in a freely licensed and downloadable database for offline use should stick with openBmap for now - Last updated in 2015
• Radiocells.org UnifiedNlp Backend - Uses Radiocells.org to resolve user location. Community-created, freely licensed database that can optionally be downloaded for offline operation. The coverage varies from country to country (it's best in central Europe).

Geocoding

• NominatimGeocoderBackend - Address lookup backend using OpenStreetMap Nominatim service.