SW Maps - SW Maps app enables users to record points, lines, polygons, and images to view them on the desired type of map.
MAPS.ME - Fast, detailed and completely offline maps for mobile devices
GPS Coordinates - GPS Coordinates is an app by Financept that comes up with features to help you in getting the GPS coordinates of your current location.
OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
Wikiloc Outdoor Navigation GPS - Follow millions of outdoor trails and record your own GPS tracks from your smartphone.
Topography APP - Topography APP enables users to geofence and surveys land by using your mobile phone.