Crompose is a suite of shell scripts that can extract rasterized pages from a multi-page document file (PS, PDF, or djvu). It can optionally impose them after having cropped white margins. This saves both trees and your sight.
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.