Peep for Mac

From PeacockMedia:

Peep cracks open any file regardless of format and lets you view each byte as data (decimal or hex notation) or as text. Try different text encodings to find the correct one or the best fit. Filter out the text from a proprietary format. Save a text file using the same or another encoding. Peep is a useful utility when programming or when wishing to extract information from a file that you can't open otherwise. Athough it looks like a hexeditor type programme, it's not intended it to be an editor but rather to inspect, access or sort out encoding problems.

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