AmphiSoft

Photoshop plugin for advanced photo sharpening without forming halos. Provides both object edge sharpen and general sharpen algorithms.

10 Photoshop-compatible plugins for special effects and photo retouch. Effects include painterly look, line halftone, metallic, misc softening and sharpening.

Photoshop plugin for copying photo tone from toned black and white photos to new images. Filter extract and save tone map of your favorite masterpiece and allow you to reapply it to another photo.

Photoshop plugin for curve line halftoning effects like woodcut, gravure or guilloche, and various "screen lines" effects. Full control over halftone line density, orientation, curvature and variations.

Photoshop plugin for painting-look effects like watercolor, dry brush and others. Filter segments source images on regions and simplify color gradations within them, apparently emphasizing borders between regions.