The success of a website is the result of various factors including the content, its frequency, functionality, design, social activity, marketing and more.

Once the website is at a certain level, the chicken-egg loop starts: popularity brings better search engine rankings, recognition in social networks and they end up in bringing more readers making the website more popular.

Although the priority should be focusing on the factors mentioned above, monitoring rankings regularly helps better understanding "how (and how fast) your content spreads" and "if search engines/social networks react enough to your efforts" to find out any possible issues.

Here are 8 free website ranking analyzers that display data from Alexa, Compete, Pagerank, and social networks like Delicious, Reddit, StumbleUpon, etc.

WooRank

WooRank is a full-featured website analyzer that not only diggs the rankings of Alexa, Delicious, backlinks, etc. but also checks other stuff like W3C validity, existance of sitemap + robots.txt file and more.

QuarkBase

The service shows traffic data, similar sites, social comments, social popularity and much more about websites.

It also categorizes website by type and lists fastest growing ones.

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GoingUp! is a free web-based website statistics service with powerful SEO features.

The service has a slick Ajaxed interface & offers a complete analytics package with web stats, referring keywords, action/goals & more.

GoingUp! tracks every activity & presents data nicely with charts, heatmaps, flags (for countries), etc.

Some of its SEO features are:

• Inbound Link Monitoring
• Google Page Rank Tracking
• Alexa Rank Tracking
• Keyword Research
• Keyword Position Tracking
• Page Optimizer Tool
• Keyword Density Tool

The service also has some other free SEO tools like "bulk domain analyzer" or "link & SEO optimizer" which can be used directly without the need of signing up.