Cross platform (lin/win/mac) geographical information system (GIS)
Traccar GPS Tracking System
A simple GPS alarm!
Showing The Amateur radio Repeaters Tool
Transport coordinate between earth(WGS-84) and mars in china(GCJ-02)
Open-source JavaScript library for mobile-friendly interactive maps
LaMa - A Localization and Mapping library
Mobile implementation of HMA standardised EO data sources
Multiplatform Ham Radio APRS and Mapping Program
CAD 2D for Land Surveying,Civil and more
GT2 combines online and offline navigation for hikers and cyclists
FAA digital chart viewer for iPhone and iPad
In-flight navigation (and more) for private pilots (Linux).