The SFF tools allow you to deal with group 3 fax documents that are stored in the "Structured Fax File" (SFF) format that is produced by most ISDN devices that adhere to the CAPI specification (see http://www.capi.org).
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.