It's not an all-inclusive list (mostly English and Italian), but it's free to try:
http://www.styleforum.net/t/24109/hof-labels-heels-and-nail-patterns-secrets-to-id-the-maker
The thread starts with clothing. You have to scroll a ways to reach the shoes. It's how I figured out that my wingtips are (probably) made by Alfred Sargent.
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