Image Processing:Main
The free world encyclopaedia for astronomy software.
Software for image processing
Siril
Siril was meant to be Iris for Linux. The new version is coming out soon. It has been updated to work with GTK+-3.4.
GIMP astronomy plugins
Website. Arch Linux AUR package.
These plug-ins for Gimp intend to be useful for astronomical image processing. They implement all basic functions for astronomy image processing, for GIMP's 8-bit images.