j already mentioned siege, which is is really great and is my go-to tool for small tests (ie a great replacement to Apache ab tool)

As soon as the scenario becomes more complex, I'd turn my head to (in that order):

• artillery (which has the same useage philosophy as Tsung, but is easier to extend because NodeJs is easier than Erlang, which I never took the time to learn)
• locust if you prefer Python
• Gatling if you prefer scala
• Tsung is you need hi perf but don't need to customize anything

There are many others, but these are the most common ones you're likely to find if you google for feedback and comparaisons.

Then you have hosted services to run load-tests, which I haven'T used enough to give any opinions.

github.com/JoeDog/siege

github.com/jepsen-io/jepsen

would be two that come to mind :) siege is basically just DoS and analyzing the response.

jepsen is the tool that elastic search, kafka, mongodb and so on get tested if they break according to the CAP-Theorem.

just to bring some open source alternatives to the table

There The result 2.99$ really useful for dev ......

2 ARM 64bit Cores

2GB Memory

50GB SSD Disk

1 Flexible public IPv4

200Mbit/s Unmetered bandwidth