mapview is an application for viewing maps on Palm OS handhelds. You can scroll through a map and switch between different layers. Layers may be used for different zoom levels. mapview includes a Perl program for building maps from image files on a Unix/Linux desktop. Instructions and a Makefile for building a demo map are included.
SAGA GIS (System for Automated Geo-scientific Analysis) is a geographical information system (GIS). The SAGA GIS API supports grid data like digital terrain models and satellite images, vector data, and tables. This API makes it easy to implement new algorithms and exempts the developer from hassle programming overhead like user-interface design or file I/O. SAGA GIS comes with a large collection of modules, in areas of terrain-analysis, geo-statistics, image processing, and process simulation.
Roadnav is an in-car navigation system capable of running on a variety of operating systems, including Linux, Windows, and Mac OS X. It can obtain a car's present location from a GPS unit, plot street maps of the area, and provide verbal turn by turn directions to any location in the USA. It uses the free TIGER/Line 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.
QGPS is a small GPS status program that is designed to work with a NMEA-compliant GPS device that outputs the GGA, GSA, GSV, and RMC strings. Aside from displaying latitude, longitude, and elevation, it also reports satellite signal strength (signal to noise ratio) and positions in the sky using a custom widget (QSatelliteTrack).
The Python Cartography Library, or PCL, is a package of modules for rendering GIS data from a variety of backends into maps. Its mission is to be the best possible Python interface to open source GIS software such as PROJ.4, GEOS, GDAL, OGR, and MapServer, and to be easy to use with Python Web application frameworks, as well as with matplotlib.