I think they have a typo in there link, i took off the extra -builder-software/ at the end and it seems to be working now.
This should be the correct link:
Discover How This Amazing Tool Can Help You To Analyze Your Website Popularity & Quietly Spy On Your Competitors Covertly
What This Amazing Software Does:
Display Page Rank & Alexa rankings for hundreds of sites you enter.
Reveal number of backlinks for each websites from 6 different sources including Google, Yahoo, Ask, AltaVista, AllTheWeb, Alexa.
Display the number of pages in your sites indexed in Google & Yahoo search engines
Allows you to spy on your competitors with just a few clicks of the mouse
Saves you time and keeps track of your SEO and link building efforts
Export data in excel sheet for deeper analysis.
And Much Much More!
DownloadLink Builder Here
100% FREE , All i ask is if you find the site helpful and useful is to bookmark it and if your happy with the downloads on the blog to leave a comment and share the blog link with your friends and family.
Submit Your Webmaster Related Sites to the NB Directory
I swear, by my life and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine.
I'm also looking if anyone post review of this software here