tangoGPS has been discontinued. Similar apps include Roadnav, which is free and open source. Other options are FoxtrotGPS. Between them they cover Linux, Mac and Windows.
Roadnav is an open source street navigation solution capable of running on a variety of operating systems. It can obtain your position from a GPS unit, plot a map of your area, and provide directions to locations in the USA.
FoxtrotGPS is a GTK+ based mapping and GPS application. It’s typically used to show a moving map showing your position in real time. It’s useful as a navigation tool, and as a track logging (e.g. for OpenStreetMap) and trip planning tool.
