locust is described as 'An open source load testing tool written in Python. Locust allows you to define user behaviour with Python code, and swarm your system with millions of simultaneous users' and is an app. There are more than 25 alternatives to locust for a variety of platforms, including Windows, Linux, Web-based, Mac and SaaS apps. The best locust alternative is Apache JMeter, which is both free and Open Source. Other great apps like locust are k6, Guardius, Loadster and Low Orbit Ion Cannon.
Pylot is a free open source tool for testing performance and scalability of web services. It runs HTTP load tests, which are useful for capacity planning, benchmarking, analysis, and system tuning.
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