Download Roadnav

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. It can also verbalize directions using Microsoft SAPI 5.1, Festival, flite, and OS X's built in text to speech engine.

Roadnav uses the free TIGER/Line (Topologically Integrated Geographic Encoding and Referencing) files from the US Census Bureau to build the maps, along with the GNIS state and topical gazetteer data from the USGS to identify locations. It has experimental support for scripting, LCDproc, importing OpenStreetMap data, and importing GPX waypoints and tracks.

Features
Generates street level maps for the US
Interfaces with GPS units to display your position in real time
Verbal turn by turn directions to any place in the US. Automatically recomputes directions if you miss a turn. (experimental)
On screen keyboard
3D (driver's perspective) view mode
Daytime and nighttime color schemes
Automatic day/night mode switching
Plots nearby landmarks and points of interest
Can operate offline (without an Internet connection)
Antialiased output
Supports multiple operating systems including Windows, Linux, and Mac OS X
Uses freely available data from the US Census Bureau and the USGS
Appearance can be customized with skins
Can output status information to LCD devices through LCDproc
GPX and OpenStreetMap support (experimental)