Best for users looking for a free, open-source alternative to Photoshop. USP: GIMP (GNU Image Manipulation Program) is a free, open-source photo editing software that offers a wide range of professional-grade features, including layers, masking, and advanced retouching tools. GIMP is highly customizable, with an active user community providing plugins and scripts to enhance its capabilities. Ideal for photographers, graphic designers, and illustrators, GIMP provides robust editing tools while remaining free of charge, making it a top choice for budget-conscious users.