The National Library of Australia has released Testing Software Tools of Potential Interest for Digital Preservation Activities at the National Library of Australia.
Here's an excerpt:
Four file format identification tools were tested: File Investigator Engine, Outside-In File ID, FIDO and file/libmagic. This represents a mix of commercial and open source tools. The results were analysed from the point of view of comparing the tools to determine the extent of coverage and the level of agreement between them.
Five metadata extraction tools were tested: File Investigator Engine, Exiftool, MediaInfo, pdfinfo and Apache Tika. The results were analysed in terms of the number and range of metadata items extracted for specific file subsets.