Is there a free application that will help me recover data from a previously formatted Amiga disk?

There are a few but these are not guaranteed to work. You could try Dave Haynie's DiskSalv version 11.32 on Aminet.

disk/salv/DiskSalv11_32.lha (118K)

However, the quality of these programs vary according to the type of error, age of the program, etc.

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