Image Editing (3)

• GIMP (GIMP) tool
  Cross-platform raster retouching and compositing, scriptable in Python and Scheme via plugins
  Digital Art #
• Digital Painting. Creative Freedom. (Krita) tool
  GPL painting program with brush engines, layers, assistants and animation; Linux, Windows, macOS
  Digital Art #
• darktable (darktable) tool
  Raw developer and photo workflow manager; non-destructive edits over a database of negatives
  Digital Art #