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libnova is a general purpose, double precision, astronomical calculation library. The intended audience of libnova is C / C++ programmers, astronomers and anyone else interested in calculating positions of astronomical objects.

Marble is a Virtual Globe and World Atlas that you can use to learn more about Earth: You can pan and zoom around and you can look up places and roads.

Mymoon is an ncurses-based tool that presents for the given latitude and longitude a continually updated display of: - Percentage of Moon's surface illumination - Distance between Moon and Earth - Moon set and Moon rise - Moon age

Astro::Flux provides a class for handling astronomical flux quantities. This class does not currently support conversions from one flux type to another (say, from magnitudes to Janskies) but may in the future.

Osmium is a C++ framework for working with OSM data files. Osmium can read OSM data in XML or binary format (PBF) and can call different handlers for each OSM object.

Astropy is a package intended to contain core functionality and some common tools needed for performing astronomy and astrophysics research with Python. It also provides an index for other astronomy packages and tools for managing them.

Pymetar is a python module and command line tool designed to fetch Metar reports from the NOAA (http://www.noaa.gov) and allow access to the included weather information.

John Walker's moontool for the X11 desktop. It shows a real-time picture of the moon phases and displays some related astronomical data about the moon and the sun. -- This version of the program uses the Motif toolkit.

GpsPrune is an application for viewing, editing and converting coordinate data from GPS systems. Basically it's a tool to let you play with your GPS data after you get home from your trip. It can load data from arbitrary text-based formats (for example, any tab-separated or comma-separated file) or Xml, or directly from a GPS receiver. It can display the data (as map view using openstreetmap images and as altitude profile), edit this data (for example delete points and ranges, sort waypoints, compress tracks), and save the data (in various text-based formats). It can also export data as a Gpx file, or as Kml/Kmz for import into Google Earth, or send it to a GPS receiver.

The xtide program predicts and displays tides. It is capable of producing output in a variety of dynamic and static formats, and has extensions for X, plain ASCII, and HTML.