Wetstone is a ...
File Systems Understood
File Search Facilities
Can it build timelines and search by creation date?
Can it search? Does it build an index? Can it focus on file types or particular kinds of metadata?
Can it create hashes of files and/or blocks? Can it compare these hash values to any databases? What sort of hash functions does it use?
Evidence Collection Features
Can it sign files? Does it keep an audit log?
Is it commercial or open source? Are there other licensing options?