For photo editing and manipulation 1) https://www.gimp.org/ https://www.gimp.org/ 2) https://www.digikam.org/ https://www.digikam.org/ 3) https://www.darktab

For photo editing and manipulation 1) https://www.gimp.org/ https://www.gimp.org/ 2) https://www.digikam.org/ https://www.digikam.org/ 3) https://www.darktable.org/ https://www.darktable.org/ Vector based editing tool 1) https://inkscape.org/ https://inkscape.org/ UI/UX 1). https://www.sketch.com/ https://www.sketch.com/ Desktop publishing https://www.scribus.net/ https://www.scribus.net/ But I haven't found a tool that is as good as Adobe Indesign for desktop publishing.