GIMP is an image manipulation programme which can be used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks. GIMP is released under GPLv3+ licenses and is available for Linux, macOS, and Windows. ( according to Wikipedia)

                                                                                                                                                                                                            Simon

                                                                                                                                                                                                        Madeleine

                                                                                                                                                                                                          Luca

                                                                                                                                                                                                       Rebecca

                                                                                                                                                                                                            Nereo