dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
GPS Status & Toolbox - Display your GPS and sensor data: Shows the position, number and signal strength of GPS satellites.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
VisualGPSView - VisualGPSView incorporates many advanced features found in professional programs.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.
RTKLIB - An Open Source Program Package for GNSS Positioning