From Castellan Systems:
Librarian is a powerful tool that allows the Project Manager, and the whole team, keep track of project documents no matter where they are stored. It maintains a register, which meets PMI & CMM requirements, but also allows for the recording of their hard and soft copy location. It can also track import project communications, including the details of who send it and who was the receiver.
The package assists the Project Manager to quickly find project files no matter whether they are stored in a file server or a SharePoint location. It also can record the version history and holders of hard copies. So what does Librarian do? It generates document identities and tracks details of documents. It can link to documents stored on file servers or SharePoint. It provides a quick means of find and opening project documents no matter where they are stored. Maintains a document version history. Maintains a register of hard copies holders of a document.