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Locust is completely event-based, and therefore it's possible to support thousands of concurrent users on a single machine.

HTML reports can be generated during the load to view response times measurement, server CPU, etc. Loadster - Load testing tool from Brickyard Technologies, Inc.

oriented to testing websites, web applications, and HTTP web services; includes graphical script editor, live reporting, and unlimited virtual users.

Load Gen - An open source load testing tool by Stanly Thomas and Mythili Vutukuru, developed as a web app.

Developed based on fiber, a user-level thread implementation in Java.

Check listed tool/vendor sites for latest product capabilities, supported platforms/servers/clients, etc; new listings are periodically added to the top of each category section; date of latest update is shown at bottom of this page.Also see Web Site Testing FAQ in the FAQ Part 2 for a discussion of web site testing considerations; also see What's the best way to choose a test automation tool?In contrast to many other event-based apps it doesn't use callbacks, instead using light-weight processes, through gevent.This allows you to write very expressive scenarios in Python without complicating your code with callbacks.Octo Perf - Commercial Saas online platform load testing service for web and mobile applications. Apica Loadtest - Offers flexible self service and full service load testing able to test 2MM concurrent users, through a network of 50 locations around the world.Key features include: Record Virtual User, design realistic virtual users, run scenario from multiple locations (Europe, USA and more), analyze bench reports to find performance bottlenecks. Test on demand or automate testing throughout development lifecycles.in the LFAQ section; there are also articles about web site testing and management in the 'Resources' section. Free open source version supports the HTTP protocol, the $pro version supports binary protocols.Go Replay - Performance testing tool that listens for traffic on production servers and feeds it to test and dev environments. Pro version supports replaying and keep-alive sessions to ensure that you get the exact same number of connections every time.