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GNU Image Manipulation Program is an open source multi-plataform application with an extensive set of features for image processing, rivaling commercial solutions such as PhotoShop or PaintShop.

Recently FITS supported was added (read the details in Alexandre Prokoudine's blog) and the application his now more than ever of interest of astrophotography.

Check also the bundle of Gimp Astronomy Plugins.

Ready to print deepsky atlas in PDF format.

Complete solution for reduction of images carried out by CCD cameras, intended on observation of variable stars. Each step of reduction process can be run from the command line or via simple and intuitive graphical user interface.

Affords the following:

SaVi allows you to simulate satellite orbits and coverage, in two and three dimensions. SaVi is particularly useful for simulating satellite constellations such as Iridium and Globalstar, O3b, Sirius Radio, GPS, Galileo and other systems.  You can also design your own.

SaVi runs on Microsoft Windows (under Cygwin), on Macintosh OS X, Linux and Unix. Uses Tcl/Tk and Unix libraries; 3D viewing option requires Geomview running on X Window.

Xplns reproduces real starry sky on your display of X Window System. It calculates the position of many celestial objects (stars, galaxies, nebulae, constellations, planets, comets, etc.) very accurately. You can enjoy the past and future sky on the desk top as if you have travelled all around the world. In solar system projection mode, you can examine motion of solar objects.

The best and most know non Windows astronomy app. «Computes heliocentric, geocentric and topocentric information for all objects; has built-in support for all planets; the moons of Mars, Jupiter, Saturn, Uranus and Earth; central meridian longitude of Mars and Jupiter; Saturn's rings; and Jupiter's Great Red Spot. allows user-defined objects including stars, deepsky objects, asteroids, comets and Earth satellites. offers many large databases including Tycho, Hipparcos, GSC, USNO.

Xplanet was inspired by Xearth. It renders images on the desktop background.

All of the major planets and most satellites can be drawn, similar to a Solar System Simulator. A number of different map projections are also supported, including azimuthal, Mercator, Mollweide, orthographic and rectangular.

Stellarium renders 3D photo-realistic skies in real time. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.

Features:

SpaceChart is a program that allows you to see the stars in 3D and rotate them to see them from any point of view. You can also limit which stars you want to see, according to their spectral class and luminosity, and draw links between all stars closer than a certain distance.

Data available includes all stars in the Hipparcos catalogue within 60 parsecs (over 190 light years) of the Sun.

The title above links to the FreeBSD port. Source to compile for other OS, namely Linux, is also available from the homepage; either as a tarball or from CVS.

Who said you needed to buy an expensive Cd-rom to have a quality sky atlas ?

Sky Charts (a.k.a. Cartes du Ciel) computes and prints customized charts of the heavens. When you download the program ("basic package") it comes with the Bright Star Catalogue (featuring stars down to mag. 6.5) and a database of 10'000 nebulae from SAC 7.2. Optionally, you may choose to download the "complete package", including also Sky2000, version 3, with 300' 000 stars to magnitude 9, high precision planetary satellites positions and Realsky support.

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