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I think Jmeter is also open source performance tool.
Thank you so much for this post and even i have an article to share and here is the link
I think Apache J Meter and Load UI are also open source performance tool.
Apache J Meter
Apache J Meter is an open source load testing tool built on the Java Platform. This testing tool is developed to test load test functional behavior and performance testing. It supports testing on static and dynamic resources such as Servlets, Java Objects, Perl Scripts, FTP servers, Data Bases, etc. It requires JVM 1.4 or higher to perform. Although it was designed initially to test web applications, today its scope has widened to other test areas.
Load UI is a very popular open source stress testing tool used for web application performance testing. It supports testing of numerous web protocols such as AMF, REST, JMS, JDBC and web sites. Many testers agree that LoadUI is one of the most interactive and user-friendly testing tools around. This tool is integrated with a functional testing tool soapUI, which adds to its effectiveness. During the testing phase it allows testers to create, configure and update their tests. LoadUI features a high graphic interface that makes testing easier.