Apache JMeter Overview
Apache JMeter is a free, open-source tool from the Apache Software Foundation for load testing and measuring the performance of web applications and other services. Written in Java, it can simulate many concurrent users sending requests to a server, then report on response times, throughput, and error rates so teams can find bottlenecks before production. It supports many protocols — HTTP/HTTPS, databases via JDBC, FTP, JMS, and more — and offers a GUI for building test plans plus a non-GUI mode for running large tests efficiently. Plugins and listeners extend reporting and analysis. The offline package installs without a network connection, though it tests servers when run. Test plans combine samplers, assertions, and listeners, and results export to CSV or render as graphs and summary reports. This page links straight to The Apache Software's official Apache JMeter source.