FarOut - The number #1 app for long distance hiking, biking, and paddling.
Sky Map - Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the...
National Park Service App - One app, every park at your fingertips.
Star Walk - Star Walk – Sky View: Explore the Stars.
Cairn - Easily share outdoor trip plans and find cell coverage in the wilderness with the Cairn app.
Stellarium - Stellarium is a free open source planetarium for your computer.