Gimp – https://flathub.org/en/apps/org.gimp.GIMP
XnConvert – https://flathub.org/en/apps/com.xnview.XnConvert
Blender – https://flathub.org/en/apps/org.blender.Blender
Upscaler – https://flathub.org/en/apps/io.gitlab.theevilskeleton.Upscaler
Inkscape – https://flathub.org/en/apps/org.inkscape.Inkscape
XNView MP – https://flathub.org/en/apps/com.xnview.XnViewMP
Krita – https://flathub.org/en/apps/org.kde.krita
Scribus – https://flathub.org/en/apps/net.scribus.Scribus
darktable – https://flathub.org/en/apps/org.darktable.Darktable