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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you're looking at a page/host that doesn't respond well to HTTP clients, there's also locust-plugins (https://github.com/SvenskaSpel/locust-plugins) That will allow you to plug headless selenium into the mix for just-like-the-user-would behavior. I wouldn't recommend putting selenium into the mix unless the load target really needs it.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.