The power tools are a set of unsupported, free of charge tools that have been created by QlikTech to help you manage your implementation.
The latest versions of the power tools are available from the QlikView Community at: http://community.qlikview.com/docs/DOC-3059.
There are 12 tools in all. Some of my favorites are described here.
The Server Agent is an easy-to-use tool that allows you to manage the state of QlikView services on many servers from one location.
This tool allows you to stop and start services—one at a time or all at once. You can also change the service user for all of the services on one server at one go (which is great, and saves you the trouble of having to change them one at a time).