Burp Suite

Burp Suite is an integrated platform for performing security testing of web applications. Its various tools work seamlessly together to support the entire testing process, from initial mapping and analysis of an application's attack surface, through to finding and exploiting security vulnerabilities.

Burp is easy to use and intuitive, allowing new users to begin working right away. Burp is also highly configurable, and contains numerous powerful features to assist the most experienced testers with their work

Burp Suite is available on a subscription basis for $349 per year. Pricing details can be found here

Features:

• An intercepting Proxy, which lets you inspect and modify traffic between your browser and the target application.
• An application-aware Spider, for crawling content and functionality.
• An advanced web application Scanner, for automating the detection of numerous types of vulnerability.
• An Intruder tool, for performing powerful customized attacks to find and exploit unusual vulnerabilities.
• A Repeater tool, for manipulating and resending individual requests.
• A Sequencer tool, for testing the randomness of session tokens.
• The ability to save your work and resume working later.
• Extensibility, allowing you to easily write your own plugins, to perform complex and highly customized tasks within Burp.

Note: the price listed is for that of a 1-year subscription.