[CPAhem]

If you're looking for a similar tool which does have a code unravel-er look at SciTools Understand[1] for C/C++/Java

My previous company used Understand on a large unfamiliar codebase, it helped greatly, but was pricey.

[1] https://scitools.com/

[popeko]

There's also Source Insight [1] which supports C/C++/Java/Obj-C - quite a fantastic tool, but unfortunately it's Windows only (Wine works with a few hiccups)

[1] https://www.sourceinsight.com/

[Operyl]

Wait a second, a tool that supports going through Obj-C is Windows only? That’s .. a shame.