Qdda
QDDA - The Quick & Dirty Dedupe Analyzer
QDDA can analyze files, block devices and data streams to find duplicate blocks so one can estimate potential storage savings by implementing deduplication-capable storage (such as Dell-EMC XtremIO or VMAX All-Flash. It will also estimate the compression ratio.
All documentation and install instructions can be found on the Github page: qdda GitHub project page