GIMP version 2.4 or higher supports the Photoshop .ABR brush format!
Files must be copied to the directory /gimp-2.x/brushes/ (where x=version number) or /usr/share/gimp/2.0/brushes/.
GIMP-Floral-Grunge-Brush by Chrisdesign
Copyright © 2011-2013 GimpBrush and contributors. All brushes are freely available
to be used, copied, modified and distributed under the accompanying licenses.