Google's American Fuzzy Lop is a brute-force fuzzer coupled
with an exceedingly simple but rock-solid instrumentation-guided
genetic algorithm. afl++ is a superior fork to Google's afl. It has
more speed, more and better mutations, more and better
instrumentation, custom module support, etc.
Read more https://packetstormsecurity.com/files/161950/AFLplusplus-3.12c.tar.gz