What CLI tools are in your toolbox for testing or troubleshooting application deployments on BIG-IP?

In trying to nail down a rate limiting solution, I reached back for my trusty apache-bench utility, ab, to push some load with concurrency at the virtual server. But...in today's SSL everywhere, discovered that ab does not have a flag to ignore SSL errors, and I don't have valid certs in my local lab, so I couldn't use that to push load. In a quick search I found hey, installed that on my ubuntu test box, and seems to be a reasonable replacement (see below). 

But that got me thinking...what cli tools are out there for test/troubleshooting that I'm missing out on?

jrahm@unuc:~$ hey -n 10000 -c 5 https://172.16.101.50/

Summary:
  Total:	8.2474 secs
  Slowest:	0.0510 secs
  Fastest:	0.0023 secs
  Average:	0.0041 secs
  Requests/sec:	1212.5047

  Total data:	20000 bytes
  Size/request:	2 bytes

Response time histogram:
  0.002 [1]	|
  0.007 [9956]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  0.012 [36]	|
  0.017 [2]	|
  0.022 [0]	|
  0.027 [0]	|
  0.032 [0]	|
  0.036 [0]	|
  0.041 [0]	|
  0.046 [0]	|
  0.051 [5]	|


Latency distribution:
  10% in 0.0032 secs
  25% in 0.0036 secs
  50% in 0.0040 secs
  75% in 0.0045 secs
  90% in 0.0050 secs
  95% in 0.0055 secs
  99% in 0.0065 secs