OS : sysbench, stress, stress-ng
Memory : memtest
Disk : dd, fio, iozone
Network : iperf3, hping3, nmap
Web : ab, hey, beeswithmachineguns (Advanced)

OS

sysbench

https://github.com/akopytov/sysbench

[root@ip-172-31-15-250 ~]# sysbench --threads=3 cpu run 
sysbench 1.0.20 (using bundled LuaJIT 2.1.0-beta2)
Running the test with following options:
Number of threads: 3
Initializing random number generator from current time
Prime numbers limit: 10000
Initializing worker threads...
Threads started!
CPU speed:
    events per second:  1693.72
General statistics:
    total time:                          10.0009s
    total number of events:              16941
Latency (ms):
         min:                                    1.03
         avg:                                    1.77
         max:                                   26.21
         95th percentile:                        8.13
         sum:                                29981.64
Threads fairness:
    events (avg/stddev):           5647.0000/92.97
    execution time (avg/stddev):   9.9939/0.01