WebScarab : WebScarab is a framework for analysing applications that communicate using the HTTP and HTTPS protocols.
Locust : A modern load testing framework
Define user behaviour with Python code, and swarm your system with millions of simultaneous users.
SPOFCheck : A CLI tool for detecting frontend SPOF, mainly blocking scripts and CSS
Mock Service Worker : Mock by intercepting requests on the network level. Seamlessly reuse the same mock definition for testing, development, and debugging.
tracing-framework : Rich tools for instrumenting, analyzing, and visualizing web apps.