Paros Proxy

Paros Proxy is another tool I've started playing with since I've began getting more into the websec side of things. It's used for evaluating web app security and performing client side attacks. It acts as a proxy and intercepts all packets going back and forth between you and the web server, giving you the ability to manipulate those packets. I was going to make a simple tutorial but this guy did a great job an explains it well, so here's his video tutorial to get an idea of how you can use Paros Proxy.