StresStimulus
Load testing tool for websites and mobile that works with hard-to-test applications.
21 Alternatives To StresStimulus
Apache JMeter
Apache JMeter™.
Dynatrace Load
Dynatrace Load lets you test the performance of web and mobile applications with the realism of load generation from the cloud.
GTmetrix
GTmetrix is a free tool that analyzes your page’s speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.

LT Browser
LT Browser is an award winning Next-gen browser to build, test & debug mobile websites. With LT Browser, you can see mobile view of website on different screen sizes and resolution.

Load Impact
How many users can my web site handle?
LoadStorm
Load test websites, web apps, APIs, and mobile apps via the cloud. Use scripts to simulate user behavior for up to a million virtual users. Try it for free!
Loader
Load testing and tracking application
Loader
Load testing and tracking application

Loadrunner
Discover how HP performance, stress, and load testing software LoadRunner can prevent costly…

Login VSI
Login VSI is a software product to test the performance and scalability of Windows based virtualized desktops by simulating user workloads.
PageSpeed Tools
PageSpeed tool analyzes and optimizes the site following web best practices.
Sitespeed
Sitespeed.io is an open source tool that helps to analyze and optimize website speed and performance.
Taurus
Automation-friendly framework for Continuous Testing.
Telerik Test Studio
Test automation solution to test desktop, web and mobile applications.
UbikLoadPack
UbikLoadPack provides plugins for Apache JMeter to load test Video Streaming, GWT Applications, Java Serialization based products and Flex.
WAPT
Load, Stress and Performance Testing for Websites and Web Applications
WebLOAD
WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
gatling
A high performance web server. Small! (125k static Linux-x86 binary with HTTP, FTP and SMB support).
gatling
A high performance web server. Small! (125k static Linux-x86 binary with HTTP, FTP and SMB support).

locust
An open source load testing tool written in Python.