Adobe http://www.adobe.com/
Aperture http://www.apple.com/
Breeze Systems http://www.breezesys.com/
Corel Painter http://www.corel.com/
Capture NX www.nikon.com
Fractalius www.redfieldplugins.com/filterFractalius.htm
Noise Ninja www.picturecode.com/
Nik Software www.niksoftware.com/index/en/entry.php
OnOne http://www.ononesoftware.com/
Photo Shop http://www.arcsoft.com/
Photo Mechanic http://www.camerabits.com/site/
PTLens http://epaperpress.com/ptlens/
PTGUI www.ptgui.com
Studio Solutions http://www.usa.canon.com/home
Topaz http://www.topazlabs.com/