The Tuck database is an incredible accomplishment. What a job to create it and maintain it! Probably possible because Tuck faithfully used series numbers.
I'm not aware of any other online publisher databases and don't think there will be any forthcoming. Consider a publisher like John Winsch. They didn't use series numbers until the 1920s so there is no way to identify cards other than describing what they look like and that doesn't work because Winsch also reframed, resized, flipped and flopped the same images so often to produce enough cards to meet buyer demands. This is the case with many other publishers.
Thousands of postcard artists' work will remain unidentified. As Bruce Hornsby said, "That's just the way it is."
