GIMP (the GNU Image Manipulation Program) is the best free photo editor around. It's packed with the kind of image-enhancing tools you'd find in premium software, and more are being added every day.
The photo editing toolkit is breath-taking, and features layers, masks, curves, and levels. You can eliminate flaws easily with the excellent clone stamp and healing tools, create custom brushes, apply perspective changes, and apply changes to isolated areas with smart selection tools.
Supported OS: Windows 7 or over
