Quick explanation about the files here:
afl-analyze.c - afl-analyze binary toolafl-as.c - afl-as binary toolafl-cc.c - afl-cc binary toolafl-common.c - common functions, used by afl-analyze, afl-fuzz, afl-showmap and afl-tminafl-forkserver.c - forkserver implementation, used by afl-fuzz afl-showmap, afl-tminafl-fuzz-bitmap.c - afl-fuzz bitmap handlingafl-fuzz.c - afl-fuzz binary tool (just main() and usage())afl-fuzz-cmplog.c - afl-fuzz cmplog functionsafl-fuzz-extras.c - afl-fuzz the extra function callsafl-fuzz-init.c - afl-fuzz initializationafl-fuzz-misc.c - afl-fuzz misc functionsafl-fuzz-mutators.c - afl-fuzz custom mutator and python supportafl-fuzz-one.c - afl-fuzz fuzzer_one big loop, this is where the mutation is happeningafl-fuzz-performance.c - hash64 and rand functionsafl-fuzz-python.c - afl-fuzz the python mutator extensionafl-fuzz-queue.c - afl-fuzz handling the queueafl-fuzz-redqueen.c - afl-fuzz redqueen implementionafl-fuzz-run.c - afl-fuzz running the targetafl-fuzz-state.c - afl-fuzz state and globalsafl-fuzz-stats.c - afl-fuzz writing the statistics fileafl-gotcpu.c - afl-gotcpu binary toolafl-ld-lto.c - LTO linker helperafl-sharedmem.c - sharedmem implementation, used by afl-fuzz, afl-showmap, afl-tminafl-showmap.c - afl-showmap binary toolafl-tmin.c - afl-tmin binary tool