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Valkyrie is a Qt4-based GUI for the Memcheck and Helgrind tools in the Valgrind 3.6.X line, developed and maintained by the Valgrind Developers. Valkyrie also includes an auxiliary tool which merges XML output from multiple Memcheck runs into a single XML file, and optionally displays the merged result in the GUI. You can see some screenshots here.
brew install valkyrie