Quick explanation about the files here:

afl-analyze.c		- afl-analyze binary tool
afl-as.c		- afl-as binary tool
afl-gotcpu.c		- afl-gotcpu binary tool
afl-showmap.c		- afl-showmap binary tool
afl-tmin.c		- afl-tmin binary tool
afl-fuzz.c		- afl-fuzz binary tool (just main() and usage())
afl-fuzz-bitmap.c	- afl-fuzz bitmap handling
afl-fuzz-extras.c	- afl-fuzz the *extra* function calls
afl-fuzz-globals.c	- afl-fuzz global variables
afl-fuzz-init.c		- afl-fuzz initialization
afl-fuzz-misc.c		- afl-fuzz misc functions
afl-fuzz-one.c          - afl-fuzz fuzzer_one big loop, this is where the mutation is happening
afl-fuzz-python.c	- afl-fuzz the python mutator extension
afl-fuzz-queue.c	- afl-fuzz handling the queue
afl-fuzz-run.c		- afl-fuzz running the target
afl-fuzz-stats.c	- afl-fuzz writing the statistics file
afl-gcc.c		- afl-gcc binary tool (deprecated)
afl-common.c		- common functions, used by afl-analyze, afl-fuzz, afl-showmap and afl-tmin
afl-forkserver.c	- forkserver implementation, used by afl-fuzz and afl-tmin
afl-sharedmem.c		- sharedmem implementation, used by afl-fuzz and afl-tmin
