Web Hacking tools

You can get full list of the hacking tools from Here

Burp suite
Download : http://portswigger.net/burp/download.html

Owasp-zap
Download: http://code.google.com/p/zaproxy/downloads/list

DirBuster:
Download: https://sourceforge.net/projects/dirbuster/
Acunitix
Download: http://www.acunetix.com/vulnerability-scanner/download.htm

w3af
Download: http://www.w3af.sourceforge.net

Nikto 
Download: http://www.cirt.net/nikto2 

Sqlmap 
Download: http://sqlmap.sourceforge.net

Tamper Data
Download: https://addons.mozilla.org/en-US/firefox/addon/tamper-data/ 

Live HTTP Header 
Download: https://addons.mozilla.org/en-US/firefox/addon/live-http-headers/

Cookie Monster 
Download: https://addons.mozilla.org/en-US/firefox/addon/cookie-monster/

Hackbar 
Download: https://addons.mozilla.org/en-US/firefox/addon/hackbar/

Hydra 
Download: http://thc.org/thc-hydra/ 



These are most important tools for attacking website(i think these are enough). If you want to work with only tools then There are lots of tools freely downloadable. Visit: HERE