Fantasy Hike, AlpineQuest, OsmAnd, Komoot, Gaia GPS, Organic Maps, FATMAP, AllTrails, Slopes, Ski Tracks, PeakFinder AR, ViewRanger, Wikiloc Outdoor Navigation GPS, Plotaroute, PeakVisor, Ride With GPS, Hiking Project, Hiking with Geeks, Ski Blackbox, Skied Demon, AlpineReplay are some alternatives to Trekarta.