Gimpimpressionist is already included in gimp but with a preview too poor and microscopic to be of some utility
with a simple hack i multiplied the hardcoded preview size from 100x100 to 600x400 offer a much bigger preview.
..here you may see the difference!
would be possible with some knowledge of C a much better preview:
script-fu-simple-contrast-mask adds a contrast mask layer above the current active layer. A contrast mask brightens the dark parts of an image and darkens the bright parts. This serves to enhance details.
The script is called "simple" because it does not ask any questions. It assumes defaults for all parameters. Specifically, the radius for the Gaussian blur is set to one percent of the shortest dimension of the image (width or height). The user can adjust the blending level after creation by adjusting the opacity in the layers dialog.
Gimp PSPI manager - enable and/or disable filters *.8bf.
The idea for PSPI Manager is based on the Brush Manager 2.00 by Sean Bogie.
[ http://myweb.msoe.edu/~bogies/brushmanager/ ]
Accessibility to filters from newly marked directories requires restart Gimp.
Requirements Python and PSPI Running Photoshop plug-ins (pspi.exe)
[ http://tml.pp.fi/gimp/pspi.html ]
In annex readme.pdf