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.

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