Burp Suite is an integrated platform for performing security testing of web applications. It is designed to support the methodology of a hands-on tester, and gives you complete control over the actions that it performs, and deep analysis of the results. Burp contains several tools that work together to carry out virtually any task you will encounter in your testing. It can automate all kinds of tasks in customizable ways, and lets you combine manual and automated techniques to make your testing faster, more reliable and more fun.
Note: Like any security testing software, Burp Suite contains functionality that can damage target systems. Testing for security flaws inherently involves interacting with targets in non-standard ways that can cause problems in some vulnerable targets. You should take due care when using Burp, read all documentation before use, back up target systems before testing, and not use Burp against any systems for which you are not authorized by the system owner, or for which the risk of damage is not accepted by you and the system owner.
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Burp Suite Free Edition v1.6 contains significant new features added since v1.5, including support for WebSockets messages, PKCS#11 client SSL certificates contained in smart cards and physical tokens, a new Extender tool, allowing dynamic loading and unloading of multiple extensions, and the BApp Store, allowing quick and easy installation of extensions written by other Burp users.
Burp Suite Professional contains a number of bugfixes and tweaks, added since the last beta version.