NaviPOWM is planned to be a car navigation system capable of running on a variety of operating systems. At the time, only OSM based map data is supported. Realtime routing engine is planned in a later version. Geocaching (http://www.geocaching.com, http://www.opencaching.de) and city guide functionality are also planned.
Description of NaviPOWM can be found on NaviPOWM.
Usefull links for 3rd party maps for NaviPOWM is found here.
Visit the Milestones page for planned milestones / releases.
FAQ is planned here.