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.

In general Google & other search engines are the primary self-marketers of websites. So, checking your website’s credibility at search engines is a good way of improving it.

Here are some major web-based (excluding softwares and browser extensions) pagerank check & seo tools websites which have resources like backlink analyzers, search engine position finders, and more.

Info: This list is not the "all SEO tools" list, but they are the ones which provide you many tools at the same place with an easy-to-use interface.

If you find these tools handy, bookmark the post at del.icio.us.

iWEBTOOL

They have almost every seo tool you may need including keywork density checker and link popularity.

Khrido

Besides the pagerank check and other webmaster tools, they have some advanced tools like mx / ns lookup, HTML Encryptor & more.

Although Khrido is not the most popular one, it is very user-friendly.

LinkVendor

They have a social bookmark link checker,  visual pagerank checker tool and a free seo report tool which are nice besides the standard seo tools.

SEOmoz

SEOmoz provides advanced website analysis tools like finding how well your website is targeted for specific keywords or countries. Their pagerank checker & similar tools can be found here.

SEO Chat

They are providing some tools for analyzing AdSense returns or comparing Google & Yahoo search results as a chart.

SEO Book SEO Tools

Besides the standard SEO tools, they have an unique keyword analysis tool & a Firefox pagerank checker extension that can be handy.

Google Trends

A great Google tool that gives you an idea about the popularity of keywords, and websites.

If you know of a great one please share at comments.