I just notice that MathMap one of the better Gimp Plugin is not listed here.To present it i just quote its developer Mark Probst--------------------------------------------------------------------------------------------------------------------------------------- ***MathMap is an image processing application that works on several levels:* Without any prerequisite knowledge about image processing, one can use any of the more than one hundred filters that come bundled with MathMap.* More advanced users can combine filters intuitively in the Composer, as pictured above.* For expert users MathMap provides a simple but very efficient programming language. This is the core of MathMap and the language that almost all MathMap filters are implemented in. MathMap can be used as a GIMP plug-in as well as a command-line tool. It is distributed as Free Software under the terms of the GNU General Public Licence. -------------------------------------------------------------------------------------------------------------------------------------
a screenshoot of one of the most interesting feature, the Composer that allow to chain several filters

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The Mathmap Gimp plugin is available for Windows and Linux (for Mac there is a older, standalone version )For more info, documentation screenshoot and video presentation see
http://www.complang.tuwien.ac.at/schani/mathmap/-----------------------------------------------------------------------------------------------------------------------------------***DOWNLOAD
http://www.complang.tuwien.ac.at/schani/mathmap/
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