I found this site during a search for filters for me to use as live effects in Xtreme. It provides access to a HUGE number of filters, both freeware and commercial. Some of the filter sets are rather old and outdated, but many are new and very good. There are a lot to sift through, which can take a bit of time.

The site may be found here: http://chezkiki.com/les_filtres.htm

Glen