It would be hard to find a Linux user who´s never heard of GIMP. Unfortunately, GPS (Gimp Paint Studio) may not be known to that many people, but it certainly deserves to be, and users deserve to know about it.
WHAT IS GPS?
From the GPS site:
"GPS is a collection of brushes and accompanying tool presets. Tool presets are a simply saved tool options, highly useful feature of the GIMP."