Dependency Walker

Dependency Walker is a utility that scans any 32-bit or 64-bit Mach-O executables (executable, so, dylib or kext) of any architectures (i386, x86_64, ppc, ppc64, arm and arm64) and builds a hierarchical tree diagram of all dependent modules.

For each module found, it lists all the functions that are exported by that module, and which of those functions are actually being called by other modules.