GIMP

GIMP (GNU Image Manipulation Program) is a cross‑platform, free and open‑source image editor. It provides advanced photo retouching, image composition, graphic design, and illustration tools. With extensive plugin support, a customizable interface, and scripting in Python, Scheme, Perl, and more, GIMP fits the workflows of photographers, designers, and scientists. Available on Linux, macOS, and Windows, it delivers professional‑grade editing without cost.