Open Source Kotlin GPS Software

NeoStumbler is an Android application for mapping wireless infrastructure and contributing measurements to geolocation databases. It collects geographic observations of cellular towers, Wi-Fi access points, and Bluetooth beacons. Users can submit collected information to Ichnaea-compatible services such as BeaconDB. An interactive map visualizes recorded measurements and helps identify areas with limited coverage. Battery-saving features include passive scanning and motion detection that pauses active scanning when the device is stationary. Privacy controls help reduce sensitive metadata in collected records. Data can be exported to CSV or SQLite for further analysis. NeoStumbler supports Android 10 and newer with a modern Material 3 interface.

GeoShare is a free, open-source Android application that simplifies sharing locations between different mapping services. It converts map links into geographic coordinates that can be opened in other installed navigation applications. Supported services include Google Maps, Apple Maps, OpenStreetMap, Waze, OsmAnd, and Organic Maps. Users can copy coordinates in different formats or save locations as GPX files. The application also supports place lists, contact integration, and sharing through messaging apps. Navigation can be launched directly in compatible applications, including TomTom. GeoShare processes links offline whenever possible and requests permission before accessing online services. Additional options support custom web maps and automatic actions.

Network Survey is an Android wireless analysis application designed for surveying cellular, Wi-Fi, Bluetooth, and GNSS environments. It displays live signal information and records measurements during configurable survey sessions. Users can save survey configurations and select where collected data is stored or transmitted. Supported destinations include local CSV files, MQTT brokers, gRPC servers, and NS Analytics. Interactive maps display cellular towers, coverage information, and recorded survey locations. A Wi-Fi watchlist generates notifications when specified networks are detected. Diagnostic tools provide LTE and 5G band information, cell identification decoding, and Wi-Fi spectrum analysis. Optional NS Scout hardware extends wireless collection capabilities. The application also supports remote survey automation and managed device configurations.

Transportr is an open-source Android application designed to simplify public transportation navigation while protecting user privacy. It helps passengers plan journeys, discover transit connections, and navigate public transportation networks across supported regions. Users can search for destinations and receive routes with transfer instructions and estimated arrival times. The application displays transit stations and complete journeys on interactive maps. Live departure information provides upcoming service schedules and real-time delays where available. GPS integration identifies nearby stations and tracks progress throughout a journey. Frequently visited locations and routes can be saved for faster access. Developed as a nonprofit project, Transportr operates without advertising or user tracking and encourages community contributions.