Low Orbit Ion Cannon!

An open source load testing tool written in Python. Locust allows you to define user behaviour with Python code, and swarm your system with millions of simultaneous users.

SOASTA's powerful load testing and performance monitoring solutions give you a crystal-clear view of the relationship between end-to-end performance, user behavior and business goals, and provides the actionable intelligence.

Loader.io is a simple cloud-based load testing servicethat allows you to stress test your web-apps & apis with thousands of concurrent connections. Made by the team behind SendGrid.

Discover how HP performance, stress, and load testing software LoadRunner can prevent costly application performance problems.

Apica ProxySniffer ™ is a professional and high-duty Web Load and Stress Testing Tool that runs on Java.

Blitz makes load and performance testing of your web site, API, iPhone and Android and Facebook apps a fun sport.

Cavisson NetStorm is a cost-effective, performance enhancing and easy-to-use appliance for enterprise applications. It is an extremely powerful load generator that provides an accurate estimation of Client Perceived Response Time (CPRT) enabling IT companies to guarantee the Service Level Agreements (SLA). Its advanced technology efficiently handles load variables, user realism, application realism and network realism. NetStorm is a proven solution providing root cause of the issues where legacy solutions failed, prompting Several Fortune 100 companies switching over to using NetStorm. »

Free Cloud Load Testing Service, Speed Testing for Websites, Applications and APIs. Helps you run load and performance tests from within browsers in minutes.

BlazeMeter is a self- service performance & load testing cloud, 100% JMeter-compatible. Easily run tests of 30k, 50k, 80k or more concurrent users, on-demand! Sign up and get a lifetime free tier to test! Time to test is minutes on our virtual testing lab.

Agileload is an entreprise-class performance testing tool which helps you creating your test scenarios fast and pinpoints performance issues whithin your application and infrastructure.Agileload :- simulates a large number of user connection from you local network and/or from the cloud- monitors in real-time your web application behaviours- detects anomalies and give you insight on the problem cause- generate custom test reports

Neustar Website Load Testing, formerly BrowserMob, uses advanced cloud technology and has a variety of plans to cater to every client - customize a plan that suits your load testing and pricing needs - including our FREE (free trial) test.

Web Performance Load Tester™ is the only web testing tool smart enough to tell you how many users your website can handle. Use another tool, and youll find yourself staring at charts for hours trying to figure it out—if you can even tell at all.

Loadster is a full-featured load testing solution for websites, web apps, and web services. It's built for real web apps and effortlessly handles cookies, user sessions, custom headers, dynamic form data and more. Loadster simulates individual user state and gathers stats for each virtual user separately.

A cloud-based load testing tool for web and mobile applications that let's record browser actions in order to load-test various usage scenarios.

"Traditional" load testing sites use cloud-based virtual machines to load test your website. One problem with this approach is that all requests sent to your site come from one or a few cloud computers. A single network bottleneck between the testing virtual machines and your website means you will never know how many users your website can take. Another problem is that full-stack web browsers that support modern HTML5 technologies such as Ajax, WebGL, video, require a lot of memory and processing power, which can be expensive even for the cloud and that cost is passed on to you. In fact - in order to save costs - traditional load testing services commission virtual machines just before a test starts and then decommission them once the test completes. It means you have to wait a long time until all virtual machines are booted up before your test starts. »