Sandcat Browser includes the following pen-test oriented features:

Live HTTP Headers
Request Editor extension
Fuzzer extension with multiple modes and support for filters
JavaScript Executor extension -- allows you to load and run external JavaScript files
Lua Executor extension -- allows you to load and run external Lua scripts
Syhunt Gelo
HTTP Brute Force, CGI Scanner scripts and more.

Download
http://www.syhunt.com/?n=Sandcat.Browser