OpenSTA Users Home Page - Free Web Load and Stress Testing Tool
OpenSTA is a free, open-source distributed testing architecture for performing HTTP/HTTPS load tests and stress testing on web applications, originally developed as commercial software but released under the GNU GPL. Users record test scripts in their browsers and replay them through a load generation engine to simulate hundreds or thousands of virtual users while collecting performance data through timers, SNMP statistics, and Windows Performance Monitor metrics. The project is community-supported and developed by users, with resources including documentation, a FAQ, community portal, and mailing list for support and discussion.