GIMP
GIMP stands for GNU Image Manipulation Program. GIMP is free, open-source application that is used for photo editing, image composition and image authoring. GIMP is distributed under the GPL (General Public License). GIMP available in most popular operating system such as Microsoft Windows, Apple Mac OS X, and GNU/Linux.
GIMP Details:
Developer(s): The GIMP Development Team
Written in: C and GTK+
Operating system: GNU/Linux, Mac OS X, Microsoft Windows, FreeBSD, Solaris, AmigaOS 4
License: GNU General Public License
Website: http://www.gimp.org/
List of Features:
• Full suite of painting tools including Brush, Pencil, Airbrush, Clone, etc.
• Sub-pixel sampling for all paint tools for high quality anti-aliasing
• Extremely powerful gradient editor and blend tool
• Supports custom brushes and patterns
• Tile based memory management so image size is limited only by available disk space
• Virtually unlimited number of images open at one time
• Full alpha channel support
• Layers and channels
• Multiple Undo/Redo (limited only by diskspace)
• Editable text layers
• Transformation tools including rotate, scale, shear and flip
• Selection tools including rectangle, ellipse, free, fuzzy and intelligent
• Advanced path tool doing bezier and polygonal selections.
• Transformable paths, transformable selections.
• Quickmask to paint a selection.
• A Procedural Database for calling internal GIMP functions from external programs as in Script-fu
• Advanced scripting capabilities (Scheme, Python, Perl)
• Plug-ins which allow for the easy addition of new file formats and new effect filters
• Over 100 plug-ins already available
• Load and save animations in a convenient frame-as-layer format
• MNG support
• Frame Navigator (in GAP, the GIMP Animation Package)
• Onion Skin (in GAP, the GIMP Animation Package)
• Bluebox (in GAP, the GIMP Animation Package)
• File formats supported (bmp, gif, jpeg, mng, pcx, pdf, png, ps, psd, svg, tiff, tga, xpm)
• Load, display, convert, save to many file formats
• SVG path import/export