Focus Blur plug-in is blurring effect, a kind of called DoF. This software makes a out of focus with luminosity and depth, like a sight or lenses. It can be used with depth map, depth fakes and shine effect. Also it can work as simple and applicable blur.
This script allows you to extract and apply saturation to a layer. When you extract, it adds a new layer with the saturation values (in gray colors). You can then use curves, brightness/contrast or the dodge tool to correct saturation. When you are okay with the adjustements you can put back the saturation by applying it.