I am looking to download an old Microsoft Web Application Stress Test Tool (WAST)
It looks like Microsoft has depricated the original Web Application Stress Test tool. In some few places various people have saved the binaries that are available for download:
Here is IBM's support site:
Also, the is another tool developed by Microsoft's dev community. The tool is called WCat. Web Capacity Analysis Tool (WCAT) is a lightweight HTTP load generation tool primarily designed to measure the performance of a web server within a controlled environment. WCAT can simulate thousands of concurrent users making requests to a single web site or multiple web sites.
Web Capacity Analysis Tool could be downloaded from here:
May I just throw in the link to Apache JMeter as an Open Source web stress test tool:
Hope this helps!