Name:Follow (Paid)
URL:http://follow.net/
Description:Tool to gain valuable competitive insight
Utility:This tool shows the following of a website - 

• Traffic estimate
• SEO
• Search Engine Marketing
• Display Advertising
• Affiliate Marketing
• Demographics
• Whois and
• Reverse IPs

Special Features:

• Sends notification when the website has a new activity
• Allows group domains by tags or separate portfolios
• Enables share with unlimited number of people 
• Chrome and Firefox extensions