Plug-ins are a great way to extend the functionality of Photoshop, adding fun filters and fresh features to the application. Although most plug-ins are modestly priced, a number of cool plug-ins are available for free. Here is a round-up of some of the best freeware plug-ins currently available for Photoshop CS3, CS4, and CS5, and, in some cases, Photoshop Elements 8 and 9. You can install plug-ins by dragging the plug-in file into the application's plug-in folder, found at /Applications/ Adobe Photoshop/Plug-ins. Many plug-ins now include their own installer, however, and some newer plug-ins must be installed via the Adobe Extension Manager. Once you have installed a plug-in, you can usually find it under Photoshop's Filter menu, though you access some plug-ins via Window > Extensions.
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