I am not aware of any tool that can simulate loads from an arbitrary Domino application database. There is a tool called Server.Load, which is built into Domino R6. It can run lots of great server load tests, but you have to write a script using its built-in commands. You cannot use it to execute parts of your application.
So I will throw this one out to readers: Does anyone know how to do load testing of a specific Domino application? Let me know.
This was first published in March 2004