Below is a list of Plugin Filter sites...some are freeware and some are pay...some allow a trial version.    

 http://hem.passagen.se/grafoman/plugtool/plugs.html

http://www.btinternet.com/~cateran/simple/

http://www.putertutor.net/paint/morestuf.htm

http://www.freewarehome.com/Graphics/

Filters_and_Plugins_p.html

http://www.flamingpear.com/

http://www.alienskin.com/

http://www.photoshop-filters.com/html/visman.htm

http://www.v-d-l.com/adrenaline_download.html

http://www.icnet.de/filters_unlimited/download.html