[pingec]

Does anyone know any similar free/open products for archiving documents, tracking etc.?

What I am after is a system like expensive solutions have in some companies where the mailbox department prints (or has preprinted) labels with unique bar codes, for any incoming mail, they open it, stick a label on it, scan it with the label on it and then physically deliver it. Some departments also input recipient and sender details, add tags etc. So in the end they have a searchable database by persons involved, content type, tags and also all documents (physical and digital) have a referenceable id that can be used for various purposes.