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SkyChart is a software to draw chart of the night sky for the amateur astronomer from a bunch of stars and nebulae catalogs. See main web page for full download.
This software is part of a full suite for astronomical observation:
https://sourceforge.net/projects/ccdciel/
https://sourceforge.net/projects/indistarter/
https://sourceforge.net/projects/eqmodgui/
Requirement:
https://sourceforge.net/projects/libpasastro/
See also:
https://sourceforge.net/projects/indi/
This is a Delphi/Pascal class that implements a realistic simulator of planetary systems. You can design your own solar system, create custom planets or other objects and establish their gravitational relations using groups. See demos for Windows using OpenGL.
SImg is astronomical image processing software for Linux. Some of the features are deconvolution (various algorithms), removing interferences, automatic shifting of images, computation of PSF and and a visualization tool.