Aexa Page Ranking by Alexaranking.com
allows you to cut and paste a number of domians and get the 3 month Alexa Ranking or you can browse your harddrive and provide a list of domains. If you have a number of sites and you want to see the Alexa Rankings, this is the way to do it.

Alexa Rank Tool by SearchBliss
gives you the Alexa Web Rank plus today, 1 week and 3 months average rank.

Alexa Ranking by Evrsoft
allows you to cut and paste a number of domians and get the 3 month Alexa Ranking or you can browse your harddrive and provide a list of domains. If you have a number of sites and you want to see the Alexa Rankings, this is the way to do it.

Lists inbound linkers, by Domain-Pop

Atom & RSS Feed Validator by feedvalidator.org
RSS feeds validator. It may validate any kind of RSS feeds, from the simplest ones to the most complex ones.

W3C Markup Validation Service by w3.org
The official W3C validator. A great help for making your pages W3C compliant.

Adword Keyword Generator by related-pages.com
is a tool that generates a list of possible keyword combinations based on lists of keywords that you provide. Has a stemming switch also.

Combine Words by Hudson Scripting
is a script is designed to combine lists of keywords for use in AdWords, Overture and other Pay Per Click systems.

Search Engine Placement Check by Marketleap
has you enter you keyword phrase and site URL and displays the top 30 results for your keyword phrase in Alltheweb, AltaVista, AOL, Dmoz, Google, AOL, HotBot, Lycos, MSN, Netscape and WiseNut.

Search Engine Position Checker by Webmaster Toolkit
allows you to enter your keyword phrases and site URL and then displays the top 50 position for those keyword phrases in Altavista, Excite, Google, Yahoo, HotBot, MSN, WiseNut, Alltheweb and Teoma.

Search Engine Positioning by SEO Guy
enables you to enter your keyword phrase with your site URL and it shows the top 100 results for those keyword phrases in Yahoo, Google, AllTheWeb, MSN and HotBot.

Search Engine Ranking Report by Top25Web.com
provides you with Google & Yahoo Rankings for multiple keywords. Just paste your key phrases, enter you domain and wait for the results. You can query up to 1000 deep. Very use full tool.

Dogpile Search Comparison by Dogpile.com
based on a study that only 1.1% of the top results for Google, Yahoo, MSN and Ask Jeeves are the same their tools gives you the top results from any 3 of the top 4 search engines.

Google vs Yahoo Graph by seobench.com
Shows a graphic display of top 50 in Google & Yahoo with the sites that are in both SERP linked.

Google-Yahoo-Ask Search by jux2
displays results from Google Yahoo and Ask Jeeves together. Jux2 can show the unique results from Yahoo! that are not in Google, or combine the results from the top ten that are in both browsers. They have some very interesting stats. Check it out I found it quite interesting.

Myriad Search by myriadsearch.com
Meta search engine that combines Google, Yahoo, MSN and Ask Jeeves on in one screen or you can select a tab of any one or all of them. You can also modify the individual influence of each search engine in the results.

Search Results Compared by yahoogooglemsn.com
Search in all three major SEs at the same time and displays the results on a single page. Very useful when it comes about comparing top SERPs.

Thumbshots Ranking by Smartdevil
is based off the Langreiter tool and gives lets you compare the results for the same word or two different words between 6 different Search Engines - Allintheweb Altavista, Google, MSN, Tecoma, Wisenut and Yahoo. Very nice tools!

Yahoo vs Google by Christian Langreiter
enables you to enter a keyword and displays a page of the linked search results from Yahoo and Google on any webpages that come up in the top 100 search results.

Yahoo-Google Search by Yahoo Watch
gives you the top 100 Yahoo results and noting the Googles position on the side. After Yahoo top 100 it then shows the remaining Google results. Very nice!

Bad Neighborhood Checker by bad-neighborhood.com
Checks link pages and reports if there are links to bad neighborhoods. The tool also has the ability to search on multiple levels (so for example if you maintain a directory it is able to spider the categories and subcategories).

Browser Screen Resolution Checker by Mark Horrell
lets you check your an URL to see what it looks like in different screen resolutions. Beats changing your screen resolution all the time.

This tool investigates the links pointing to a website (backlinks), and groups them according to the C-Class IP addresses they come from.

Class C Checker by webrankinfo.com
Enter 2 to 10 URLs and check if the URL are sharing the same class C IP range.

Class C Range Checker by TextLinkBrokers.com
enables you to cut & paste a number of domains or browse to a file that has a list of domains and check whether they are on an unique Class C IP.

DNS Report by dnsreport.com
checks your domain and does email test. Checks over 50 different things and giaves a pass, warning, fail or info.

Domain Age Tool by webconfs.com
Displays the approximate age of a website on the Internet and allows you to view how the website looked when it first started. It also helps you find out the age of your competitor's domains, older domains may get a slight edge in Search Engine Rankings.

Domain Dossier by CentralOps.net
resolves IP to host, host to IP, runs a traceroute, and displays the zone file and does a whois look up.

Domain Stats Tool by webconfs.com
Provides domain information like Age, Yahoo WebRank, count of Backlinks and number of pages indexed in Search Engines like Google, Yahoo, and Msn.

Free Site Monitor by 321sitemonitor.com
Monitors server status at every 5 minutes and e-mail in case of problems. Also can display stats when a server was down; may be also useful for checking and competitors uptime.

HTML Header Viewer by Webmaster Toolkit
gives shows you the the HTTP headers that the web server is sending. Shows Cookies being sent, re-directs and mini-type.

HTTP / HTTPS Header Check by webconfs.com
Allow you to inspect the HTTP headers that the web server returns when requesting a URL. Works with HTTP and HTTPS URLs.

IP Address Report by ip-report.com
gives you report on domains you either add to a field or load up from a file. It tells you which domains are in the same Class C block. If you enter the domains into the field you can save them to a file to use next time.

Reciprocal Link Checker by etown-webdesign.com
Free links partners script. Periodically checks all your partners links to see if they're still linking back.

Redirects And HTTP Headers Checker by gsitecrawler.com
Checks for redirects that may be in place on a domain (301, 302, 200, etc).

Sandbox Detection Tool by SEOmoz.org
add a keyword phrase, your Web site, and the date your site was first spidered by Google and you will get a in depth report whether you are effected by the new site filter (sandbox filter).

Search Engine Friendly Redirect Checker by webconf
will check to see if your redirect of a URL is search engine friendly. Will also tell you if you have a redirect.

What Is My IP Address by WhatIsMyIPAddress.com
shows you the IP of the computer you are on or the firewall you are behind if you have a private IP.

Free Broken Link Checker by dead-links.com
check domain wide for broken outbound links. Very very very nice!

Free Link Checker by SEO-HighRankings.com
checks the URL of a single page for broken outbound links. This tools only checks the page you enter.

Online Free Reciprocal Link Checker by recip-links.com
checks the list of reciprocal you cut & paste into there form. It checks the page, not the whole site and reports back the URLs that it found had a link to your domain, the URLs that didn't have a link to your and any URLs that errored out.

Site Link Analyzer by SEO Chat
displays a list of internal and external links and their anchor text for input webpage.

Advanced Google Search Methods by AlgoTech
enter domain and keyword and select numberous searches includeding allintitle, allinurl, allinanchor, allintext, site, define, sponsored links and results with sandbox penalty suspended.

Free Google Keyword Ranking Tool by Nichebot
enter keywords, domain, depth of search (10-1000), any/all or exact phrase and choose one of the 101 Google country sites to search from.

Google Datacenter Watch Tool by McDar
is a tool that will let you do a search on Google at all the different datacenters. This shows whether the different datacenters are giving different different Ranking results for the same key phrase.

Google One Line Results by Google
enables you to view Google's search results with each entry on one liner.

Google Rank Position by PRSearch.net
allows you to enter a search term and the domain to search for. It returns the position that search term has on Google WITH, the number of entries that search term is indexed for, the PR of your home page, the size of file, the number of inbound links the site has and lets you know if you are in the DMOZ or Google Directory.

Google Rankings by googlerankings.com
searches for the entered URL and keyword in the first 1000 pages.

Retrieve SERPs by seocritique.com
Google dataceter SERP checker. Input the keyword and select the range of datacenter IP's and see the SERPs.

Online XML Sitemaps Generator by xml-sitemaps.com
A free online Google XML Sitemaps generator for small sites and a commerical php script for larger sites.

Del.icio.us - Social Bookmarker by del.icio.us
Social bookmarking. One of the newest trends in SEO.

Your Personal Web File by furl.net
Social bookmarking. One of the newest trends in SEO.

Free Keyword Search Tool by Nichebot
shows for entered keyword and simular keywords the number of times searched in 60 days according to WordTracker and Google results and Google exact results page numbers.

Free Meta Keywords Tool by Apogee-Web-Consulting.com
reads the meta keywords and gives you a hotlink with each keyword to Overture Keyword Selector Tool, Google AdWords Keyword Tool and Nichbot Free Keyword Identification Tool.

Google Adwords Keyword Tool by Google
provides you with 2 lists of words, Specific keywords that are that include your keyword that have been searched on Google and Similar keywords that are relevant terms searched by uses that searched for your keyword also.

Google Keyword Suggestions by SEO Chat
give you relevant and popular terms related to the keyword you search for. This tool queries information from Google searches for your keyword and determines popular and re-occurring terms and displays them with a field that shows there relevent per cent. Very good tool.

Google Suggest by Google
will offer completions when you type in your keyword for searches. I have found this very helpful in keyword mining.

Keyword Generator by Espotting Media
provides you with keywords from there PPC data base. Espotting powers over 1.4 billion searches every month across Europe. With offices in the UK, Ireland, France, Germany, Spain, Italy, Sweden, Denmark and Norway.

Keyword Popularity Tool by 123 Promotion
has made a number of changes to there Overture Keyword Popularity Tool. It now searches not only Overture's database but WorkTracker also! It looks like the same tool but the results in the search term field is an anchor text that opens up a whole new set of data and word mining possibilities. In the new set of data it tells you how many times Google and Yahoo find this term on the internet, there is a list of related words which is linked to let you conduct a dictionary.com or thesaurus.reference.com search or to research on one of the related words. Very nice tool, and very useful for copywriters.

Keyword Research Tool by Webmaster Toolkit
will generate a list of keywords and keyword phrases used in other web sites based on the keyword or keyword phrase you enter into their tool. This tool searches other sites with your choice of one of the 9 listed search engines and displays what other web sites that are optimized for the keyword phrase you entered are using for keywords on their site. Very helpful tool!

Keyword Suggestion Tool by Digital Point Solutions
shows the per day keyword results from both Overture and Wordtracker. Wordtracker breaks the results down in plural and singular where Overture combines them together. For example Overture reports "anime wallpage" as 2609 per day where Wordtracker shows "anime wallpaper" with 3160 per day and "anime wallpapers" with 1948 per day. The different totals don't matter, it is the plural/singular percentages that you need to help you decide which keyword to target.

Search Term Research by PrioritySubmit
requires an username and password but it has lots of features. They claim to have the biggest database, with over 9 billion searches compiled from 37 sources that include major international, pay per click, meta and regional engines. You can search on spell:keyword, related:keyword, like:keyword and crawl:keyword . The tool will search Overture's data from 16 different countries. There is just too much to list here. Go sign up and get take a peek.

Search Term Suggestion Tool by Overture
allows you to enter a prospective keyword and it returns the related keyword phrases and the number of times they have been searched in the last month on Overture search engines such as Yahoo, MSN, Altavista and Hotbot. You use this kind of data to help you choose the keyword phrases you want to target. This tool is a "must use" as you don't want to target keywords that no one is searching for!

Website Keyword Suggestions by webconfs.com
This tool tries to determine the theme of your website and provides keyword suggestions along with keyword traffic estimates. Keyword suggestions are provided using Overtures database.

GoogleDuel Original by GoogleDuel
enables you to compare two different words to see which is more popularity on the internet. This tool is a fast way to check you keywords to see where plural or singlar is the more common form used on the internet.

Keyword Density by SEO Chat
will analyze your entered URL, and return a list of key phrases with their corresponding density values for one, two, or three word key phrases. You can choose whether you want the longs key phrase to be 1, 2 or 3 words long.

Keyword Density Analyzer by Stargeek
gives you keyword density for 1, 2 and 3 word combinations.

Keyword Density Analyzer by Internet Marketing
Keyword Density Analyzer by Internet Marketing gives you keyword density in your title, meta description, meta keywords, visible text, alt tags, comment tags, image tags, option tags, reference tags, linked text and URL.

Keyword Density Analyzer by seobench.com
Enter URL, will calculate and return the keyword density of key phrases which are 1,2 and 3 words long.

Keyword Density Tool by Webmaster Brian
generates a list of one, two and three word key phrases from the URL you enter in. Instead of giving you the number of keywords on the page it gives you the density ratio of each keyword to the page.

Keyword Generator Tool by 123 Promotion
generates a list of keywords from your webpage text (copy and paste your text only, not the page code). This will help you to see what keywords your webpage is optimized for. Keep in mind these may not be the keywords you want to use, but this tool lets you know what keywords your current webpage is optimized for. This is one of the better Keyword Checking tools as it shows keyword phrases that are one, two and three words and not only single words as many keyword tools do! Check the frequency your top keywords are searched on the internet against the Overture and Wordtracker keyword tools. This way you can know if you are targeting keywords that are searched often.

Keywrd Density Analyzer by Jim Tools
your webpage and give you a full report on the optimization of that page. There is just to much to list for this tool. It checks from your anchor text to your Yahoo listing and everything in between.

Ontology Finder by goRank
gives you synonymous words of your keywords to consider for possible keywords or just to add to your webpage.

Backlink Anchor Text Analyzer by webconfs.com
Blacklink analyzer that provides a report of the URL and anchor text of up to 1000 of your backlinks that Google is showing. If you have more than one link on the inbound page it show each of the anchor texts.

Free IBL Check by IBL Check
takes the keyword you input and tells you the number of inbound PR4 links with the anchor text being the keyword that you would need to get first page SERP. This tool needs a bit of tuneing. It would be nice if it would also give the averages for the PR and backlinks for the bottom 5 on the first page SERP. That would give you a better idea what it takes to get into the the bottom half of the first page.

Link Appeal by Webmaster Toolkit
will calculate the desirability rating of having a link on the URL you specify. This calculation includes factors such as pagerank, number of outbound links and the overall percentage of links to html. It is intended as a guideline for evaluating whether you should ask for a link on a certain page or not.

Link Popularity & Site Analysis Tool by LinkVendor
shows your inbound links and pages in Google, Yahoo, MSN, Ask Jeeves, and Alexa. Also shows PR, archive date (wayback machine), number of outbound links on the page and whether the site is in Dmoz and Yahoo directory. Shows the number of words and charactors in the Title, meta keyword and meta description and shows on a graph where the page has to many or to little.

Link Popularity Analysis Tool by RustyBrick.com
provides you with all the data you need to analyze a page's link popularity. This tool looks a sites backlinks on Googleand provides you with a summary of all your links under the catagories of pagerank, domains, anchoring text, internal and external link counts, Page Titles, IP Addresses, Link Ratios and relevent pages. This tool is hot! Requires Google API key.

Link Popularity Checker by Marketleap
displays inbound link reported by Alltheweb, Alta Vista, Google/AOL, HotBot, MSN & Yahoo and provides a total of them. But what makes this tool shine is its new trend/history report. Yes that is correct it will give you the history of links for your site. Now that is hot!

Link Popularity Checker by PRSearch.net
searches Google, Yahoo, MSN Search, Altavista, Alltheweb and Hotbot for inbound links to your site.

Link Popularity Checker by Webmaster Toolkit
enables you to enter your URL shows the number of links your site has in Google, Altavista, MSN, AlltheWeb and Yahoo.

Link Popularity Tool by iconinteractive.com
Off-page (popularity) stats including number of backlinks, number of indexed pages, number of pages containing the URL.

Link Quality Assessment by elixirsystems.com
Shows pages indexed, inbound links, deep link percentage, links from Yahoo Directory, DMOZ, EDU, and GOV.

Report Bot by reportbot.com
reports, links and pages indexed from Google, alltheweb, MSN, HotBot & Yahoo, Tool PageRank, Alexa Ranking and checks where you are listed in DMOZ - and it fast!

Required Text Links Estimator by Text Link Brokerage
enables you to input a keyword and returns the number of inbound links for the the top 10 sites on Google have with Google, Yahoo and MSN. It also estimates how many PR4 links is required to get 1 page SERP for that keyword.

Uptime Bot by uptimebot.com
Off-page (popularity) stats. Great for keeping track of your progresses.

Adsense Ad Display by google.blogspace
lets you enter you URL and shows what AdSense ads would be displayed for that web page.

Check Yahoo WebRank by webconfs.com
Allows you to check the Yahoo WebRank of up to 5 URLs at a time.

Domain Directory Checker by 123 Promotion
checks your domain to see if it appears in Business.com, DMOZ, Gimpsy, GoGuides.com, Jayde, JoeAnt, Skaffe, Websavvy, Yahoo, and Zeal.

Keyword Competition Analyzer by SEO Rank
displays the number of web pages on Google, Yahoo, MSN & HotBot that contain the keyword you enter. Nice tool that gives you all the numbers in one shot!

Search Engine Index Checker by Marketleap
will display the number of your site pages that are in the database of Alltheweb, AltaVista, Google/AOL and HotBot Search Engines. It also enables you to enter up to 5 URLs of competing sites and compares your site to those sites in a graph. MarketLeap also stores this data so your can view your trend/history report.

URL Rewriting Tool by webconfs.com
Generates Apache Mod-Rewrite code to help you convert dynamic URLs to static looking URLs. Create a file called '.htaccess' and paste the code generated into it.

URL Trends by urltrends.com
Full off-page (popularity) statistics (like number of backlinks, indexed pages, etc).

MSN Position Search by Prsearch.net
You can search up to 15 keywords for the entered domain and from the top 100 to the top 500.

MSN Rankings by Devppl.com
Lets you find Rankings for International, Denmark, Norway, Sweden and UK.

Datacenter Quick Check by McDar
lets you add you URL and check all Google datacenters for BackLinks, PR and Ranking of keyword.

Future PageRank Tool by SEO Chat
will query all of Google's various data-centers and display your Pagerank value for each one. If queried during a Google update you will get a glimpse of upcoming PR changes.

Page Rank Tool by pagerank.net
shows PR on the differnet Google datacenters. Good for monitoring a PR update.

CPM and CPC ROI Calculators by Yahoo
CPC Tool -- calculates return on investment (ROI) in percent based on monthly click, average CPC, conversation rate and average profit per conversion. CPC Tool -- calculates return on investment (ROI) in percent based on monthly impressoins from CPM advertising, cost of CPM, Conversion rate, average profit per conversion.

Overture Bid Amounts by Pixel Fast
lets your search for keywords and shows the overture bid amounts.

Backlink Checker by ThinkBLING
checks your webpage for backlinks and returns the number of backlinks for each PR position. Requires Google API key.

Google PageRank Calculator by ThinkBLING
lets you search on keywords and give you the top tem pagerank and backlinks.

Google PageRank Prediction by RustyBrick
Looks at your URL and predicts what your Page Rank will be at the next PR update based on the backlinks Google shows.

Google PageRank Report by Top25Web.com
lets you check the PR of unlimited number of sites at a time. Now all you have to do is cut and paste you list of webpages and there you have it all before you with one click. Very nice!

Multi DC PageRank Checker by seobench.com
This tool will query the various Google Data Centers to check for any changes in PageRank values for a website. Helps you get a peek at your websites NEW PR during a PageRank update.

Page Rank Grid Calculator by WebWorkshop
enables you to construct a grid showing the relationship of your website pages to each other and calculates the PR for each page. This tool will show you how you can concentrate PR to your home page, how dangling links bleed off PR from your site, and overall give you a better understanding of how PR works.

Page Rank Search by PRSearch.net
provides you with Google results but includes a PR bar and the number of inbound links the site has.

Page Rank Search Results by ThinkBLING
allows you to do Google searches with the PR reported with the search results.

Pagerank Calculator by Mark Horrell
is quite a bit different than WebWorkshop's Page Rank Grid Calculator and to tell you the truth I didn't find any use for it. I will spend some more time on it later but I thought it should be in here as Mark Horrell has a lot of good things to say about Pagerank.