The Plugin Site

These are my current favourites - but had to put 6 as I couldn't decide which of the last 2 to include.

Alien Skin Xenofex 2 Crumple
Eye Candy 4000 Drip
Flaming Pear Aetherize
Flo’s Filters Undistort
Xero Radiance
Mehdi Absolute Colour

But there's still an awful lot of filters I haven't tried ............

The questions is always for what purpose, e.g. graphic design, photo correction, photo effects, web design, scrapbooking etc. And even within these categories some plugins are better for certain tasks than others.

Xero, Clarity (increases perceived sharpness, can modify saturation)
Redfield, SketchMaster (photo-to-drawing/watercolor/crayon,etc)
Xero, Caravaggio (photo-to-oil-painting)
Rosenman, Pinocchio (precise deformation)
EyeCandy3, Fur (texturize underexposed hair)

[My typical aims are to make so-so photos or web-captures worth looking at and to make unremarkable photos into interesting images.]