Outliner is a Photoshop-compatible plug-in for Windows designed by ImageSkill Software that can work as with commercial software like Adobe Photoshop, Adobe Photoshop Elements, Corel (Jasc) Paint Shop Pro, Microsoft Digital Image Suite as free like software IrfanView, XnView.
It gives a user the easiest way to get image contouring with desired quality. This plug-in just picks out various edges making them more expressive. The user can easily manage range of edge appearance in the processed image getting fantastic artistic effects. Outliner can be very useful plug-in for web designers creating graphic icons and for artists dealing with engraving.
Download: Outliner 2.0