Apache Jmeter : Open-source load testing software

Apache Jmeter is an open-source load testing software designed to load test functional behavior and measure performance. It can be used to simulate heavy loads on a server, group of servers or network to test an application's strength or to analyze overall performance under different load types.

Apache Jmeter's list of features include:

• load and performance tests
• full-featured Test IDE that allows fast Test Plan recording, building and debugging
• dynamic HTML reports
• Full multi-threading framework
• extract data in HTML, JSON, XML or any textual format
• CLI mode to load test data from any Java-compatible OS

Why should you choose Apache Jmeter?

• open-source license: the software is free-to-use 
• easy to setup: Simple installation process
• data visualization: test results can be displayed in charts, tables, and log files
• multiple testing strategies: Jmeter can be used for load testing and functional testing
• user-friendly interface
• customizable: you can design your own type of tests