Portable GIMP (64-bit) for Windows

The description of Portable GIMP (64-bit) - Play With New Friends

A free, open-source image editor, in a single file, for your thumb drive, hard drive, CD, etc. No installation required! Whether you are a graphic designer, photographer, illustrator, or scientist, GIMP provides you with sophisticated tools to get your job done. You can further enhance your productivity with GIMP thanks to many customization options and 3rd party plugins.