This is a file archiving system. You submit it files with a set of metadata, as key-value pairs, and it allows you to later retrieve the files that match conditions on these metadata.
It uses a flat file-store where files are stored under their 40 characters SHA1 hash, and a SQLite3 database for the metadata.
Its purpose is to be used as a persistent file store for the VisTrails workflow and provenance management system: http://www.vistrails.org/