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.
You can download it from the following link: https://packetstormsecurity.com/files/download/161822/AFLplusplus-3.11c.tar.gz
Source: https://packetstormsecurity.com/files/161822/American-Fuzzy-Lop-plus-plus-3.11c.html