I don't see GraphicsMagick mentioned in the "Imaging and Color - Image Formats, I/O, and Processing Libraries" section. The software is offered under the MIT/X11 license.

Our source repository started over 21 years ago (September 19, 1998).

Bob
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Bob Friesenhahn
bfriesen@..., http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt