Plug-ins

PC Resources for Photoshop - Plug-Ins - FF Galleries & Collections
Filters Unlimited.
http://www.netins.net/showcase/wolf359/adobepc.htm
http://perso.club-internet.fr/gpl/index.html
http://www.v-d-l.com/
http://privat.schlund.de/f/filter-factory - créer ses propres filtres
http://www.kt.rim.or.jp/~takinami/