The best open source alternative to oMaps is Organic Maps. If that doesn't suit you, our users have ranked three alternatives to oMaps and three of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to oMaps are OsmAnd and Mobile Trail Explorer.
Experience a privacy-oriented GPS solution with Organic Maps, featuring turn-by-turn navigation, offline maps, and a commitment to community development. Enjoy zero data collection, no location tracking, and comprehensive OpenStreetMap data for diverse travel modes.
Navigation app offering offline and online OSM-based maps, turn-by-turn voice direction, driving, cycling, and walking modes, POI search, GPX track management, map overlays, monthly map updates by country or region, speed and safety features, and location sharing.
Mobile Trail Explorer is an application where user can view and record tracks using the mobile phone and GPS device (either external or internal). Recorded tracks can be exported in KML or GPX formats so that they can be viewed in Google Earth application.
Estonia
EU
Netherlands
Finland