Quick explanation about the files here:

• afl-analyze.c - afl-analyze binary tool
• afl-as.c - afl-as binary tool
• afl-cc.c - afl-cc binary tool
• 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 afl-showmap, afl-tmin
• afl-fuzz-bitmap.c - afl-fuzz bitmap handling
• afl-fuzz.c - afl-fuzz binary tool (just main() and usage())
• afl-fuzz-cmplog.c - afl-fuzz cmplog functions
• afl-fuzz-extras.c - afl-fuzz the extra function calls
• afl-fuzz-init.c - afl-fuzz initialization
• afl-fuzz-misc.c - afl-fuzz misc functions
• afl-fuzz-mutators.c - afl-fuzz custom mutator and python support
• afl-fuzz-one.c - afl-fuzz fuzzer_one big loop, this is where the mutation is happening
• afl-fuzz-performance.c - hash64 and rand functions
• afl-fuzz-python.c - afl-fuzz the python mutator extension
• afl-fuzz-queue.c - afl-fuzz handling the queue
• afl-fuzz-redqueen.c - afl-fuzz redqueen implementation
• afl-fuzz-run.c - afl-fuzz running the target
• afl-fuzz-state.c - afl-fuzz state and globals
• afl-fuzz-stats.c - afl-fuzz writing the statistics file
• afl-gotcpu.c - afl-gotcpu binary tool
• afl-ld-lto.c - LTO linker helper
• afl-sharedmem.c - sharedmem implementation, used by afl-fuzz, afl-showmap, afl-tmin
• afl-showmap.c - afl-showmap binary tool
• afl-tmin.c - afl-tmin binary tool