N-Stalker HTTP Brute Force tool does what the name says. It is an HTTP authentication brute force tool that works by taking a web macro and attempting to run a series of authentication requests to obtain valid credentials (you may provide your own user and password list).

N-Stalker HTTP Brute Force can be invoked by clicking on "HTTP Brute Force" button under "Miscellaneous Tools":

Here are the next steps to use N-Stalker HTTP Brute Force: