Organic Maps is a free Android & iOS offline maps app for travelers
Open Source Routing Machine - C++ backend
GPS log file viewer and analyzer
Minimalistic wide-open GPS-locator/tracker
Offline OpenStreetMap maps for iOS and Android
An easy-to-use bike equipment manager and bike rides manager
See your friends from VKontakte on the map
Satellite Emulator
A tile-based map viewer with support for GPX files.
Batch-mode algorithm to handle large data sets of GPS data
A frontend for gpsbabel
In-flight navigation (and more) for private pilots (Linux).