[papa]

3D Shadow:

This handy tool easily creates various types of 3D shadows from objects such as letters, numbers, shapes and so on. All settings are present in a single window - transparency level, perspective, shadow color and position, X/Y/Z angles, and some others.

http://www.artistic-effects.com/3dshadow.html

3D Sphere Generator:

This filter will generate a 3D sphere and allow you to configure many of its properties. The site has some other nice plugins.

http://www.richardrosenman.com/software/downloads/

VirtualPhotographer:

This plugin lets you instantly apply high quality, professional photographic styles to your digital images, with just one click.It includes over 50 presets that automatically apply combinations of film grain, color modification, B/W, soft focus, high contrast and many artistic effects to achieve the same professional-looking images that used to take hours of photo editing. Get results in seconds!
http://www.optikvervelabs.com/

Purple Fringing Removal:

1. PFree 1.2 ( http://www.sd3.info/pf828/PFree/PFree0-1.html )
A PhotoShop plugin, developed using FilterMeister, that reduces purple fringing on the Sony DSC-F828 and probably other digicams as well. Drop the filter, an .8bf file, into your PhotoShop filters directory, usually something like c:\program files\Adobe\Photoshop\PlugIns\Filters.
2. PTShift ( http://www.pinlady.net/vr/ )
A Javascript that runs in Photoshop CS/CS2


All the plugins are free. If you know some even better freeware plugins, please share here.