Cross platform (lin/win/mac) geographical information system (GIS)
Organic Maps is a free Android & iOS offline maps app for travelers
LaMa - A Localization and Mapping library
GPS navigation software for Windows Mobile & WinCE devices.
Navigational Algorithms - Marine navigation
Minimalistic wide-open GPS-locator/tracker
Interactive, thoroughly customizable maps
Offline OpenStreetMap maps for iOS and Android
See your friends from VKontakte on the map
Q-Rap (www.QRap.org.za) is a Radio Network Planning plug-in for QGIS
Library for OpenStreetMap offline rendering and routing
Subway maps of the World !
Former project page
In-flight navigation (and more) for private pilots (Linux).