GV Mirror downloads all the Google Voice messages in a user's account. It downloads SMS messages, voicemails, and details of missed, received, and placed calls. It also creates csv files.
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.