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Alexa provides information about websites including Top Sites, Internet Traffic Stats and Metrics, Related Links, Online Reviews Contact Information and Search Analytics for SEM and SEO optimization. The Alexa Toolbar is a browser add-on that shows d...

Estimate Website Value. Domain value calculator. Website value calculator and web information

Huge selection of twitter buttons/icons for blog, homepage or any other website. Easy to install.

YouTube is a place to discover, watch, upload and share videos.

Check whois information of domains, ip address, lookup dns servers and site expiry dates

StatsCrop - a web service that lets you explore any website informations and its history, understand your competitor

Web technology information profiler tool. Find out what a website is built with.

TrafficEstimate.com profiles millions of websites providing traffic statistics, web analytics, keyword and competitor analysis, contact information, and more.

Check your site rank, backlinks, indexed pages on search engine and find social links.

From AboutUs: See what information we have on Wiki and share your knowledge.

Quantcast is a new breed of measurement service helping buyers and sellers quantify the characteristics of digital audiences against which they can activate addressable advertising solutions.

SemRush.com

W3Techs provides information about the usage of various types of technologies on the web.