OCM is an easy to use program for managing your geocaches, with the goal of being the Linux equivalent to GSAK. OCM integrates with GPSBabel to support most GPS devices (requires GPSBabel to be installed).
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.