Best altitude software for free download

Hotair microphone game Guy uses your voice level from the microphone object to control the altitude of the hot air balloon. with just a little more work, one could easily make this into a game.
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Geocode photos with latitude, longitude, and altitude info. Stamp the images or write to the EXIF headers. Export Google Maps, KML KMZ files for Google Earth, Shapefiles (SHP), AutoCAD DXF files, or Flickr. Import from tracklogs, waypoints or GPX.
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HS GPS is a software library (with full C source code) which provides access to a NMEA-183 compliant GPS receiver via a serial communications port, decoding NMEA sentences: $GPGGA, $GPGSA, $GPGSV, $GPGLL, $GPRMC and $GPVTG.
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