Apache JMeter

Apache JMeter is a popular open-source performance testing tool used to test the performance of web applications, APIs, and various other services. It can simulate a high load on a server, database or network to measure its performance under different conditions. JMeter can also be used for functional testing, regression testing, and stress testing. It supports multiple protocols like HTTP, FTP, JDBC, and SOAP, and can generate a variety of reports and graphs to help analyze the test results. JMeter is written in Java and can be run on multiple platforms. It is widely used by developers, testers, and performance engineers to ensure that their applications can handle the expected load and perform optimally under different circumstances.