Where can I find good open source code flow visualization software?

Question

I am working on an academic research regarding some very long functions in the Linux kernel (link, link).

For that research, I would like to use some code flow visualiza

Answer 1

History flow's are very neat for changes/diff across multiple versions.

Codeplex has a project, Dependency Visualizer which does support C also.

Gprof2Dot can render oprofile, this would get you dynamic info also.

CodeViz also (static tool) would work.

If your using gcc, gcc-xml has an introspector plugin also todo this.