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Pagerank & Alexa ranking are not the the only factors that people will look at when analyzing the strength of a website. There are many elements come into play including but are not limited to basic on-page optimizations, domain age, inbound links, number of indexed pages in search engines, backlinks from social mediasphere (i.e. Digg, StumbleUpon et al) and xhtml, css validation.
Advertisers of these days are more concerned on how a website evolves; whether they are artificially boosted (blackhat) or naturally developed. I came across a few useful FREE SEO websites that provide thorough analysis as I hang out a lot in DP forum. Some of the websites are now buried deep in DP archives and I couldn't find a way to dig them out as most of them resided in threads totally unrelated to SEO things. So I decided to collect and list them (SEO tools that I still remember vividly) in this post.
Here is a list of FREE SEO tools.
1. Website Grader - This website provides a score that incorporates things like website traffic, SEO, social popularity and other technical factors. It also provides some basic advice on how the website can be improved from a marketing perspective.
2. Xinu Returns - Find out how well your site is doing in popular search engines, social bookmarking and other site statistics.
Note: I've seen websites with similar framework and template so I presume Xinu run on a similar script.
3. URL Trends - Features Pagerank, Alexa, number of baclinks from Yahoo & Google and many more. Fast at delivering result.
4. IwebTool - Provide pagerank prediction, in-depth analysis on backlink information, multi rank checker, website speed test and few more analysis.
Note: Pagerank prediction doesn't work most of the time.
5. SEO Book Tool - Features Search Analytics Tools, Keyword Research Tools, Competitive Research Tools, Link Analysis Tools & Search Engine Ranking Checkers.
6. SEO Digger - SEO Digger is a decent keyword gathering and research tool but what it really helps me with is determining a given site's overall theme and keyword focus. Apart from a list of search queries, wordtracker and overture results are also determined (keyword popularity calculated by Wordtracker.com). Data is also CSV-exportable.
7. QuarkBase - Provide overall stats related to social media popularity, traffic details and technical information.
8. Check Page Rank of Internal Pages - This is one of my favorite SEO tools and particularly useful after every pagerank update. The only downside is, it only registers 100 entry before it comes to a stop.
Note: Sometimes it's not responding but that is the only working Internal Pagerank checker I found so far.
There are many great FREE SEO tools out there but not listed here. If you find them to be useful and would like to share with our readers, please don't hesitate to add up your favorite SEO tool by commenting this post.
Technorati Tags: Free SEO tools, complete site statistics, SEO analysis

Sep 18, 2008 at 23:30:13
I’m currently utilising #4 : Iwebtool…
Going to try out the rest of your list… Thanks for sharing
Sep 19, 2008 at 04:43:59
website grader is my favorite :)
Sep 19, 2008 at 05:13:21
google adwords keyword tool?
Sep 21, 2008 at 08:48:57
Thanks for the tools. I have used most of these. One thing that Im still in search of is a good free backlink checker. I have used the top ones but they doesnt display everything that I am looking for. I guess i will just have to pay for SpyGlass for now
Sep 21, 2008 at 13:15:02
I have tried Quarkbase and Website grader. Will try the rest.
Sep 27, 2008 at 19:56:13
website grader ,this one is the best one.
Thanks for your post.
Oct 1, 2008 at 01:52:37
I’ve been looking for online SEO tools for weeks now. Great list! I’m going to try them to see whichever is the best. Thx!
Oct 14, 2008 at 08:30:30
Check out more free SEO & Webmaster Tools at http://tools.khrido.com/
Nov 3, 2008 at 18:41:07
i’m currently used this tools. it work great even in free edition
Nov 16, 2008 at 14:11:42
thak you for good service
Nov 17, 2008 at 08:48:38
I like to other PR tools like
http://iwebtool.com - you can add some to your site
http://pr-checker.net - collection of the best PR tools
http://domainpagerank.com - to check fake PR
and also the webmaster tools at DP is quite useful.