Mixed Greens 
Promotes visual artists and documentary filmmakers by selling art, exhibiting artwork, producing films and cultivating new collector bases.
http://www.mixedgreens.com/Metropolart
Online listing of contemporary artists, sorted by name, European city or technique. Also exhibitions and museums.
http://www.metropolart.com/
ArtAreas.com
List artworks by style, subject, medium or ethnography. Free listings for artists, galleries or collectors.
http://www.artareas.com/
art-exchange
Artist database for art buyers and sellers.
http://www.art-exchange.com/
Buy Original Art
Provides listings and information about online venues for purchasing original artwork.
http://www.buy-original-art.com
