PixaFlux is a photo and graphics editing application designed to provide users with powerful tools for creating professional-looking images. It allows users to quickly compose, edit, and enhance images with a wide range of features and tools. The app includes tools for cropping, rotating, and adjusting the size and position of images, as well as a variety of filters, textures, and effects for creating unique compositions. PixaFlux also includes tools for combining multiple images into a single composition, and for adding text, shapes, and other elements. The app also supports layers, allowing users to experiment with different effects or to isolate specific elements of an image. PixaFlux is available for both Mac and Windows, and it is free to use.
GIMP is not really an alternative, if you want to have node-based, non-destructive image processing functions.