Ggcov is a GTK+ GUI for exploring test coverage data produced by C programs compiled with gcc -fprofile-arcs -ftest-coverage. It's basically a GUI replacement for the gcov program that comes with gcc.
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.