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SExtractor is a program that builds a catalogue of objects from an astronomical image. Although it is particularly oriented towards reduction of large scale galaxy-survey data, it performs rather well on moderately crowded star fields.

WeatherSpect provides a reasonably accurate simulation of what the weather looks like outside, in ASCII art. It includes rain, snow, lightning, sleet, and hail. The windspeed and cloudiness are reflected in the velocity and quantity of clouds. There are trees that age, reproduce and die over the course of an hour, and a sun and moon that follow the actual sun and moonrise. There's also a dancing turtle.

A dockapp that displays the rise and set time of the sun.

xeartk is a tkgeomap application that uses the geomap::wdgeomap command to create an interactive map. The geographic data is from the xearth root window program. by Kirk Lauritz Johnson in an interactive widget. xeartk is not part of and does not require xearth. It only uses the outline data defined in file mapdata.c of the xearth source distribution. The cities are from factmonster. Adjust the map view by Shift-Double-Clicking or Shift-Dragging. Double click a dot to display information about the city there on the terminal.

Xephem is an interactive astronomical ephemeris program for X Windows systems. It ... computes heliocentric, geocentric and topocentric information for fixed celestial objects and objects in heliocentric and geocentric orbits; has built-in support for all planet positions; the moons of Jupiter, Saturn and Earth; Mars' and Jupiter's central meridian longitude; Saturn's rings; and Jupiter's Great Red Spot Elwood Downey ecdowney@noao.edu August 1995

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.

JOSM is the "Java OpenStreetMap Editor". It is a feature-rich editor for the experienced OSM mapper. It requires some configuration efforts. But if you intend to become a great OSM mapper, it's worth the time you need to get used to it.

JuK is an audio jukebox application, supporting collections of MP3, Ogg Vorbis, and FLAC audio files. It allows you to edit the "tags" of your audio files, and manage your collection and playlists. Its main focus, in fact, is on music management.

A program for adjusting audio mixers from the command line or scripts, or interactively at the console or a terminal with a full-screen, ncurses-based interface and sysmouse(4) support. Can optionally be built with a GTK+-based interface.

Adapted from the Web page: AutoZen generates sounds meant to cause the user's brain waves to shift to a different dominant frequency, resulting in an altered state of consciousness. If you are under treatment for any psychiatric or neurological disorder, you might want to approach this with caution. You must use headphones for AutoZen to work at all. The effect depends on each ear receiving a different tone, and the combination of the inputs in the brain. If you are deaf in one ear, it will not work.