Apache JMeter - Apache JMeter™.
Oracle Application Testing Suite - Oracle Application Testing Suite is a comprehensive, integrated testing solution for web applications and services.
Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
SMARTBEAR ReadyAPI - SMARTBEAR ReadyAPI is one of the legit and professional automated testing API platforms that allows teams to create and run automated security tests for APIs and SOAP APIs.
locust - An open source load testing tool written in Python.
Cisco TrustSec - Get more with Cisco TrustSec software defined segmentation technology. Facilitate dynamic role-based policy enforcement across your network.