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Xearth sets the X root window to an image of the Earth, as seen from your favorite vantage point in space, correctly shaded for the current position of the Sun. By default, xearth updates the displayed image every five minutes. The time between updates can be changed with the -wait option. Xearth can also render directly into PPM and GIF files instead of drawing in the root window. There are three additional marker files installed in /usr/local/lib/X11/xearth which specify the locations of various FreeBSD people and places: freebsd.committers.markers - FreeBSD committers freebsd.submitters.markers - FreeBSD submitters freebsd.ftp.markers - FreeBSD FTP mirrors

GPSBabel converts waypoints, tracks, and routes from one format to another, whether that format is a common mapping format like Delorme, Streets and Trips, or even a serial upload or download to a GPS unit such as those from Garmin and Magellan. By flattening the Tower of Babel that the authors of various programs for manipulating GPS data have imposed upon us, it returns to us the ability to freely move our own waypoint data between the programs and hardware we choose to use. It contains extensive data manipulation abilities making it a convenient for server-side processing or as the backend for other tools.

GPSBabel converts waypoints, tracks, and routes from one format to another, whether that format is a common mapping format like Delorme, Streets and Trips, or even a serial upload or download to a GPS unit such as those from Garmin and Magellan. By flattening the Tower of Babel that the authors of various programs for manipulating GPS data have imposed upon us, it returns to us the ability to freely move our own waypoint data between the programs and hardware we choose to use. It contains extensive data manipulation abilities making it a convenient for server-side processing or as the backend for other tools.

A tool to "stamp" photos taken with digital camera with a location, where they were taken. It uses the GPS coordinates saved in GPX format.

gpsd is a service daemon that monitors one or more GPSes attached to a host computer through serial or USB ports, making all data on the location/course/velocity of the sensors available to be queried on TCP port 2947 of the host computer. With gpsd, multiple GPS client applications (such as navigational and wardriving software) can share access to GPSes without contention or loss of data. Also, gpsd responds to queries with a format that is substantially easier to parse than the NMEA 0183 emitted by most GPSes.

GpsDrive is a car (bike, ship, plane) GPS navigation system. GpsDrive displays the position provided from a NMEA-capable GPS receiver on a zoomable map. The map file is autoselected depending on the position and preferred scale. Speech output is supported if the "festival" software is running. Waypoint database is supported via MySQL (optional).

GPS Manager (GPSMan) is a graphical manager of GPS data that makes possible the preparation, inspection and edition of GPS data in a friendly environment. GPSMan supports communication and real-time logging with both Garmin and Lowrance receivers and accepts real-time logging information in NMEA from any GPS receiver.

Xphoon sets X the root window to a picture of the moon in its current phase.

CFITSIO is a library of C and Fortran subroutines for reading and writing data files in FITS (Flexible Image Transport System) data format. CFITSIO simplifies the task of writing software that deals with FITS files by providing an easy to use set of high-level routines that insulate the programmer from the internal complexities of the FITS file format. At the same time, CFITSIO provides many advanced features that have made it the most widely used FITS file programming interface in the astronomical community.

The GPSTk is an open source C++ library for developing GPS applications. The GPSTk suite consists of a core library, auxiliary libraries, and a set of applications. The GPSTk provides a wide array of functions that solve processing problems associated with GNSS such as processing or using standard formats such as RINEX. The libraries are the basis for the more advanced applications distributed as part of the GPSTk suite.