ggcov is a GTK+ GUI for exploring test coverage data produced by C and C++ programs compiled with gcc --coverage. So it's basically a GUI replacement for the gcov program that comes with gcc. Please note: ggcov is not a frontend for gcov; instead it reads the same data files directly and does various extra processing on them.

ggcov also has a web interface which provides a large fraction of the functionality of the GTK+ GUI. Try it out.

ggcov also has a commandline interface which is useful for nightly builds and Continuous Integration servers.

ggcov is released under the GNU General Public License (GPL) version 2 with no warranty. See the file COPYING in the distribution or here