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Conversion Tools
Geographic Translator (GEOTRANS)
http://earth-info.nga.mil/GandG/geotrans/index.html
This is an application program which allows you to easily convert geographic coordinates among a wide variety of coordinate systems, map projections, and datums.
NOAA's Magnetic Declination Calculator
http://www.ngdc.noaa.gov/seg/geomag/jsp/Declination.jsp
The NOAA Satellite and Information Service has provided a useful tool to compute current magnetic declination for every location in the U.S. by zip code. Compass users often must deal with the difference between where the compass needle points, or magnetic north (a place that wanders slowly within the Canadian Arctic) and geographic or true north (the North Pole). This difference is an angle called magnetic declination. Unfortunately magnetic declination changes (significantly) over time and location. When accuracy is important, and particularly if the map was created some time ago, it is good to confirm the declination.
Unit Converter 1.2
http://www.geocities.com/jandjrockets/unitconverter.html
This is a unit converter program written in Python, programmed by Joseph Nicholas. It has all the most commonly used units for length, temperature, pressure, mass, speed, energy, time, area, and volume.