Loader.io - Loader.io is a simple cloud-based load testing service
Google web toolkit - Google web toolkit is a development tool mostly used by world-class developers for building and optimizing complex browser-based applications.
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
Web Tool Kit Online - Web Tool Kit Online is a website that provides an online tool for developers helping them to develop an application in C++ without any hurdle.
Apache JMeter - Apache JMeter™.
nginx - A high performance free open source web server powering busiest sites on the Internet.