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Sourcetrail is a productivity tool for software developers on Windows, Mac and Linux. It uses static source code analysis to provide a visualization that lets you follow calls and other dependencies.
V. Saraswat, R. Jagadeesan, M. Michael, and C. von Praun. PPoPP '07: Proceedings of the 12th ACM SIGPLAN symposium on Principles and practice of parallel programming, page 161--172. New York, NY, USA, ACM, (2007)