If you are a (digital) photographer and enjoy experimenting to improve your work or be creative, beyond GIMP or Adobe Photoshop there is also an interesting application to use either stand alone or as a plug-in: Mathpad. This link will take you to the home page where you can read all about it and download for free. There is a group on FLICKR for sharing your results or just for having a look at what is possible. The integration with GIMP is very easy and works well, or at least it did for me!
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