GNU/Linux user since 1996. Got my first telescope (a venerable (read: ancient) Meade 2080 LX) this year, and started doing some astro-photography.
My graphics-related workflows nowadays contain mostly GIMP, darktable and Siril.
For 3D-printing, I use openscad, Cura, Octoprint, and Marlin on an Ender 3.