Mathmap is a very flexible Gimp plugin created and maintained by Mark Probst, official page is on [link]
where you may found most recent version also for Mac and Linus
This is a more recent version for Windows xp Vista , the last stable 1.2.4 , compiled time ago for Windows xp Vista by JamesH but was hard to be found.
I added to the default examples (filters) others originally created and shared by various author on Mathmap group on Flickr and on gimp sides as Gimptalk, and previously collected here [link]
and here [link]
They are all grouped in
well ... should be clear
Result is a animation
This last is a very specific set :
all filters created to edit equirectangular images, ( most accept as input only images of exactly 2:1 ratio )
at start MM display a console with a ( harmless ) error message , you may ignore it and just wait for the real plugin interface to show up
2 "instant preview is enabled by default but, in windows that may block the sliders and sort of freeze the user controls.
Solution is simply uncheck "automatic preview "box, and click instead on the preview button when needed