Duff is a Unix command-line utility for quickly finding duplicates in a given set of files. Duff is written in C and should build and run on most modern Unices.
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Finddupe is a VERY FAST command line C program to catalog very large archives, identifying duplicate files even when offline. It has many features. You can easily grep a catalog to find what you have, and locate where it is.
Idas (I Don't Accept Seconds) is a high-performance duplicate file detector. Idas plugs into your favorite Unix filter and can tell you exactly which files have been seen before, regardless of whether or not it appears with the same filename.