>>> WEB DEVELOPMENT HELPER
A browser extension to provide tools for the Web developer including ASP.NET page and control developers.
Site : www.nikhilk.net
>>> INTERNET EXPLORER DEVELOPER TOOLBAR
Site : www.microsoft.com/downloads/…
>>> FIDDLER
Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP Traffic, set breakpoints, and “fiddle” with incoming or outgoing data. Fiddler is designed to be much simpler than using NetMon or Achilles, and includes a simple but powerful JScript.NET event-based scripting subsystem.
Site : www.fiddlertool.com