Cflow

GNU cflow is a flow graph generator that is part of the GNU Project. It reads C source code files and generates a flow graph of external references. It uses only source files; does not need to run the program. It was initially an implementation of the UNIX cflow utility.

GNU cflow
Developer(s)	GNU Project
Operating system	Linux, UNIX
Type	flowgraph generator
License	GPL (free software)
Website	gnu.org/software/cflow/

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cflow (UNIX utility)

cflow is a POSIX-defined shell command for generating a C-language flowgraph. Besides GNU, there are other implementations of cflow, like the one for Tru64 Unix.^[1]