Astronomy
Aladin
Astronomical Sky Atlas and star catalogue for astronomical images and datasets
AOQPlot
Visualize quality info for radio data
Cubeview
3D FITS data viewer for spectro-imaging
fv FITS Editor
View and manipulate FITS-format files
GCX Astro-Image Processor
Process astronomical images and control CCDs
Gpredict
Satellite tracker
IRAF
Image Reduction and Analysis Facility
OpenUniverse Space Simulator
Explore the solar system in this accurate simulation
Siril
Astronomical image (pre-)processing program
KStars
Desktop Planetarium
Planets
A simple interactive program for playing with simulations of planetary systems
QFitsView
Astronomical Data Visualization Application
AOFlagger GUI
Visualize radio data & RFI algorithms
SAOImage DS9
Astronomical Data Visualization Application
ESO/Starlink SkyCat
Astronomical Data Visualization Application
TOPCAT
Tool for OPerations on Catalogues And Tables