BaseMap - BaseMap is the only outdoor app you will ever need. Turn your phone into a GPS, map your outdoor adventures, and interact with the BaseMap community.
GPS Status & Toolbox - Display your GPS and sensor data: Shows the position, number and signal strength of GPS satellites.
VisualGPSView - VisualGPSView incorporates many advanced features found in professional programs.
HuntStand - HuntStand is an app featured with hunting and land-management that helps you to access the nationwide database of public and private landowners to view property lines, owner names, and WMA coverage comprehensively.
RTKLIB - An Open Source Program Package for GNSS Positioning
Trail Sense - An Android app which uses your phone's sensors to assist with wilderness treks or survival situations.