Siril is an astronomical image processing software for Linux. Dev here is stopped: as of 2013/02, Siril development has moved and is regaining activity here http://free-astro.vinvin.tf/index.php/Siril/en
Just 1st time used it for processing of Lovejoy photos -- great program! Final result on my twitter feed PyZahl.
Thanks for Siril, it's good!
Looks promising but... please!!! Add a manual... It will be highly appreciated!