AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
Artsy - A global platform for discovering and collecting art.
Mosaic Creator - Mosaic Creator is professional mosaic tool. You can create your own picture mosaic.
ArtMajeur - +1 Million original artworks, Free Shipping Worldwide, Low prices guaranteed, 14 days return: buy all the art you love on Artmajeur!
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.
WikiArt - The Encyclopedia of Fine Art