Many people contribute to GIMP in various ways. We include here only contributions, not deviations.
code.google.com/p/gps-gimp-paint-studio/ is the site of the GIMP Paint Studio, which is a cleverly built collection of brushes, together with a collection of predefined tool presets. See Chapter 15 for more about this site.
www.pgd-design.com/gimp/ offers a collection of GIMP brushes and patterns.
ljfhutch.blogspot.com.au is the blog of L.J.F. Hutch, a professional 2D painter. The site offers a large collection of brushes.
The following sites contain important and specific plug-ins or plug-in sets:
ftp://ftp.gimp.org/pub/gimp/plug-ins/v2.6/gap/ is not a website but an FTP site for the GAP plug-in. For more about GAP, look at the GIMP documentation or read Chapter 6 and Chapter 18 of this book.
gmic.sourceforge.net is the G’MIC site.
liquidrescale.wikidot.com is the site for the Liquid Rescale GIMP plug-in.
sites.google.com/site/elsamuko/ is the site for the Elsamuko plug-in set.