Related software
The GIMP 32-bit
Free image manipulation tool
The GIMP 64-bit
The GIMP is a multi-platform photo manipulation tool. GIMP is an acronym for GNU Image Manipulation Program. The GIMP is suitable for a variety of image manipulation tasks, including photo retouching, image composition, and image construction. It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc. Full suite of painting tools including brushes, a pencil, an airbrush, cloning, etc. Tile-based memory management so image size is limited only by available disk space Sub-pixel sampling for all paint tools for high-quality anti-aliasing Full Alpha channel support Layers and channels A procedural database for calling internal GIMP functions from external programs, such as Script-Fu Advanced scripting capabilities Multiple undo/redo (limited only by disk space) Transformation tools including rotate, scale, shear and flip File formats supported include GIF, JPEG, PNG, XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others Selection tools including rectangle, ellipse, free, fuzzy, bezier and intelligent Plug-ins that allow for the easy addition of new file formats and new effect filters
PSD Codec
View PSD files without Photoshop
Gimp Painter
Edit your photos and drawings for free
Paint.NET
Free image composition software
Inkscape
Inkscape is an open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X. What sets Inkscape apart is its use of Scalable Vector Graphics (SVG), an open XML-based W3C standard, as the native format. In contrast to raster (bitmap) graphics editors such as Photoshop or Gimp, Inkscape stores its graphics in a vector format. Vector graphics is a resolution-independent description of the actual shapes and objects that you see in the image. A rasterization engine uses this information to determine how to plot each line and curve at any resolution or zoom level. Contrast that to bitmap (raster) graphics which is always bound to a specific resolution and stores an image as a grid of pixels. Inkscape can import and display bitmap images, too. An imported bitmap becomes yet another object in your vector graphics, and you can do with it everything you can do to other kinds of objects (move, transform, clip, etc.) While Inkscape does not have all the features of the leading vector editors, the latest versions provide for a large portion of basic vector graphics editing capabilities. People report successfully using Inkscape in a lot of very different projects (web graphics, technical diagrams, icons, creative art, logos, maps).
Portable GIMP
Take the popular GNU image editor anywhere with you
GIMP Extensions
All You Need To Know About GIMP Extensions
GIMPshop
GIMPshop: Make The GIMP look like Adobe Photoshop
Tux Paint Stamps
Free add-on for Tux Paint
Chrome OS Linux
Run Linux apps natively on Chromebooks
RIOT
Radical Image Optimization Tool