GIMP (GNU Image Manipulation Program) is a free, open-source image editing software with advanced features similar to Adobe Photoshop. It supports a wide range of image file formats and has powerful tools for editing, retouching, and enhancing images. GIMP also includes features for creating graphics, designing user interfaces, and batch processing. The latest version (2.10.0) has improved performance, a revamped user interface, and new tools like the unified transform tool.