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.

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Home Page: http://www.imagemagick.org/
Language: C with API's provided for C++ and Perl
Platform: Windows, Linux, OSX
License: Custom open source license that requires attribution. Free for commercial use. GPL compatible.