Asiva Sharpen+Soften software provides users with precise control over sharpening or softening specific areas of an image.
Thanks to the Hue, Saturation and Luminance curves, you have the unrestricted ability to select which pixels in your image you want to sharpen or soften. Moreover, the range of adjustments allows you to produce natural-looking effects, and you can always tweak the curves to your liking.
To use this plug-in, you require Adobe Photoshop 5.5 through CS2. If you have these versions, you're all set to take advantage of the plug-in's unbeatable sharpening and softening capabilities. Give this plug-in a try, and you won't be disappointed!