Siril


Siril is an astronomical image processing tool which can be used for all parts of the image creation process, from calibration, registration and integration, through to final image creation using a collection of powerful tools for gradient removal, stretching, channel combination, noise reduction, deconvolution, cosmetic correction, correction of mis-shapen stars and so much more.
You can learn more about the myriad capabilities of this software on the Siril website.