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GeographicLib is a small set of C++ classes for performing conversions between geographic, UTM, UPS, MGRS, geocentric, and local cartesian coordinates, for gravity (e.g., EGM2008), geoid height, and geomagnetic field (e.g., WMM2010) calculations, and for solving geodesic problems. The library may be used from .NET applications using the NETGeographicLib wrapper library. It is a suitable replacement for the core functionality provided by geotrans.

gkrellmoon is a moon clock plugin for Gkrellm2. This plugin is based upon the glunarclock and wmMoonClock applications. The port is based on the original gkrellmoon port for Grellm1 by Patrick Li.

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

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.

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.

jday and j2d are command line utilities to convert calendar dates to astronomical julian dates, and julian dates to calendar dates. There is a corresponding library libjday.a which can be used for the same functionality within applications.

Libkgeomap is a KDE4 C++ wrapper around world map components such as Marble, OpenstreetMap, and GoogleMap, for browsing and arranging photos on such maps.