file extension XCF

ImageMagick

ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.

The functionality of ImageMagick is typically utilized from the command line or you can use the features from programs written in your favorite programming language. Choose from these interfaces: G2F (Ada), MagickCore (C), MagickWand (C), ChMagick (Ch), ImageMagickObject (COM+), Magick++ (C++), JMagick (Java), L-Magick (Lisp), NMagick (Neko/haXe), MagickNet (.NET), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (PHP), IMagick (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick (Tcl/TK). With a language interface, use ImageMagick to modify or create images dynamically and automagically.

Blender

Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.

Blender is a fully integrated 3D graphics creation suite allowing modeling, animation, rendering, post-production, realtime interactive 3D and game creation and playback with cross-platform compatibility - all in one free downloadable package.

Gimp

GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

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.

GIMP is expandable and extensible. It is designed to be augmented with plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.

XnView is a utility for viewing and converting graphic files.

It has the features :

* Import about 400 graphic file formats
* Export about 50 graphic file formats
* Multipage TIFF, Animated GIF, Animated ICO support
* Image IPTC, EXIF metadata support
* EXIF auto rotation support
* IPTC editing
* Resize, rotate, crop support
* Lossless rotate & crop (jpeg) support
* Adjust brightness, contrast...
* Auto levels, contrast
* Modify number of colors
* Apply filters (blur, average, emboss, ...)
* Apply effects (lens, wave, ...)
* Fullscreen mode
* Slide show with effects
* Batch convert, batch rename
* Create WEB page easily
* Screen capture
* Create contact Sheet
* Create or edit Multi-page file (TIFF, DCX, LDF)
* TWAIN & WIA support (Windows only)
* Print support (Windows only)
* Drag & Drop support (Windows only)
* Compare image side by side
* Filmstrip layout
* 44 languages support (Windows only)
* And many many other things..
* No Adware, No Spyware

XnView is provided as FREEWARE for private non-commercial or educational use (including non-profit organization).