Description: OpenStreetMap is a free, open-source, crowd-sourced map of the world. Volunteers collect map data using GPS devices, aerial imagery, local knowledge, and other free sources to create and update the map database.
Type: software
Pricing: Open Source
Description: PocketMaps is an open source, offline GPS navigation app for Android. It allows you to download maps for offline use and navigate by GPS without an internet connection.
Type: software
Pricing: Open Source