Ask HN: What tools are you using for load tests?

Which specific tools do you rely on for load testing? Any less-known ones that have proven invaluable?

Do you prefer CLI or GUI?

Are you using paid tools? If so, is the ROI evident?

Is it integrated into your CI or otherwise run automatically?

How closely do your load tests mimic real user behaviour?

Are there any emerging technologies you're exploring for load testing?

I'm beginning the process of load test architecture/planning at my company and would love to hear your thoughts.