Tricentis - Tricentis Tosca is an effective end-to-end testing suite for enterprises, providing functional software testing tools.
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
TestZeus - World's first open source vertical testing agent
Loader.io - Loader.io is a simple cloud-based load testing service
Katalon - Built on the top of Selenium and Appium, Katalon Studio is a free and powerful automated testing tool for web testing, mobile testing, and API testing.
Loadster - Loadster is a full-featured load testing solution for websites, web apps, and web services.