Most Essential Free 150 SEO Tools for Professional Bloggers & Webmasters

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After researching in several months ,we have made a useful list of the Most essential Free 150 SEO Tools for Professional Bloggers & Webmasters .

1.New SEO Tools (8)

Google vs Yahoo Graph		Graphic display of top 50 in Google & Yahoo linked.
Keyword Density Analyzer		Enter URL, determines density of 1, 2, and 3 word phrases.
Keyword Grouper		Tool transforms lists of up to 10,000 keywords into an organized keyword structure.
Keyword Tool		Online keyword suggestion, aggregating over 1 billion unique keywords and hundreds of millions of related terms from diverse sources.
Multi DC PageRank Checker		Check PR values across all Google datacenters.
Niche Finder		Online tool that returns structured keyword suggestions rather than a disorganized list.
Retrieve SERPs		Google datacenter SERP checker.
SEO Tools		WordStreams suite of free keyword tools is the easiest way to improve the quality of your keyword research.

2.Alexa Tools (4) 

Alexa Page Ranking		Cut & Paste or browse file for domain list - Displays Alexa Ranking. Good for checking large number of domains.
Alexa Rank Tool		3 month, 1 week, today Alexa Rank.
Alexa Ranking		Cut & Paste or browse file for domain list - Displays Alexa Ranking. Good for checking large number of domains.
Alexa Related Rank Check		Input up to ten domains - get 1 week, 3 month average & 3 month up/down Alexa Ranking.

3.Backlink Tools (1) 

Backlink Check Tool

Shows anchor text for your sites backlinks.

4.Code Validation (2) 

Atom & RSS Feed Validator		RSS feeds validator
W3C Markup Validation Service		Official W3C compliance validator

5.Combined Keyword Suggestion Tools (1) 

Combine Words

Combine words script for PPC systems.

6.Combo Search Engine Ranking Tools (4)

Search Engine Placement Check		Enter URL/Keyword - Displays top 30 for 11 Search Engines.
Search Engine Position Checker		Enter URL/Keyword - Displays top 50 for 9 Search Engines.
Search Engine Positioning		Enter URL/Keyword - Displays top 100 for 5 Search Engines.
Search Engine Ranking Report		Input key phrase list & get Google & Yahoo Rankings.

7.Compare Search Engine Ranking Tools (8) 

Dogpile Search Comparison		Shows top results from 3 search engine.
Google vs Yahoo Graph		Graphic display of top 50 in Google & Yahoo linked.
Google-Yahoo-Ask Search		Combines search results from Google, Yahoo! & Ask Jeeves.
Myriad Search		Metasearch engine that combines Google, Yahoo, MSN and Ask Jeeves.
Search Results Compared		Google, Yahoo, MSN results in one search
Thumbshots Ranking		Based off the Langreiter tool but lets you compare 6 different Search Engine Results with each other.
Yahoo vs Google		Langreiter - Graphic Compare of Google & Yahoo top 100 results.
Yahoo-Google Search		Shows top 100 Yahoo/Google results together.

8.Domain Tools (17) 

Bad Neighborhood Checker		Checks if you’re linking to bad neighborhoods
Browser Screen Resolution Checker		Check what you Website looks like in different
C Class Backlink Analyzer Tool		Shows your links for differnet Class-C site.
Class C Checker		Class C IP range checker.
Class C Range Checker		Unique Class C IP Checker - Cut & Paste or load up a file.
DNS Report		Checks your domain and does email test.
Domain Age Tool		Determines the age of the domains entered.
Domain Dossier		IP to host, host to ip, traceroute, whois zone file. Hot Tool!
Domain Stats Tool		Enter domain and getdomain age, number of pages indexed, and number of backlinks.
Free Site Monitor		Server monitor and alert service
HTML Header Viewer		Shows HTTP headers the web server is sending.
HTTP / HTTPS Header Check		Allow you to inspect the HTTP headers that the web server returns when requesting a URL.
IP Address Report		Bulk class C IP address checker.
Reciprocal Link Checker		Checks if the partners still link back
Redirects And HTTP Headers Checker		Checks for redirects on a domain
Search Engine Friendly Redirect Checker		Enter URL - Check your redirect to see if it is SE friendly
What Is My IP Address		Shows the IP of your computer or routers.

9.Exchange Link SEO Tools (4) 

Free Broken Link Checker		Tests all links site wide and reports any broken links.
One Way Link Verify		Track your one-way links - Shows status and PR.
Online Free Reciprocal Link Checker		Enter links - Reports back which ones are up, down or unreachable.
Site Link Analyzer		Lists internal and external links for input URL.

10.Google Ranking Tools (6) 

Advanced Google Search Methods		Enter domain/keyword and do different Google searches like site etc.
Google Datacenter Watch Tool		Shows the differnet Ranking results for different datacenters.
Google One Line Results		Google displays each results as one-liners with anchor text the title.
Google Rank Position		Shows Google rank position, PR, number of entries indexed, DMOZ and Google Dir status.
Google Rankings		Enter URL/Keyword - Searches the first 1000 entries.
Retrieve SERPs		Google datacenter SERP checker.

12.Google Sitemap Tools (1) 

Online XML Sitemaps Generator

A free online Google XML Sitemaps Generator

13.Internet Bookmarking (2) 

Del.icio.us - Social Bookmarker		Social bookmarking
Your Personal Web File		Social bookmarking

14.Keyword Suggestion Tools (14) 

Free Keyword Search Tool		Displays keyword data using Wordtracker and Google search results.
Free Meta Keywords Tool		Reads meta keywords and hotlinks them to 3 keyword mining tools.
Google Adwords Keyword Tool		Keyword tool from Google that provides Specific and Similar keywords.
Google Keyword Suggestions		Queries Google for related relevant and popular terms.
Google Suggest		Google keyword completions when searching.
Keyword Generator		Keyword searches from Espotting Media’s (UK) PPC database.
Keyword Popularity Tool		Search Overture & WordTrackers database - Mines these terms with dictionary, thesaurus etc.
Keyword Research Tool		Tool returns similar keywords found in the meta keywords of sites searched by your choice of 9 search engines.
Keyword Suggestion Tool		Keyword searches from Overture and Wordtracker (Wordtracker displays singular/plural & correct order).
Keyword Tool		Online keyword suggestion, aggregating over 1 billion unique keywords and hundreds of millions of related terms from diverse sources.
Niche Finder		Online tool that returns structured keyword suggestions rather than a disorganized list.
Search Term Research		Searches Overture data for 16 countries and more.
Search Term Suggestion Tool		Shows keywords and frequency searched on Overture (Yahoo/MSN) last month.
Website Keyword Suggestions		Provides keyword suggestions along and keyword traffic estimates for the entered website.

15.Keyword Tools (8) 

GoogleDuel Original		Compares the popularity of two words - Good for checking Plural/Singlar.
Keyword Density		Enter URL - Generators keyword phrases from your webpage and displays density.
Keyword Density Analyzer		Enter URL - Displays 1, 2, and 3 word combinations.
Keyword Density Analyzer		Enter URL/Keywork - Displays density each different page component.
Keyword Density Analyzer		Enter URL, determines density of 1, 2, and 3 word phrases.
Keyword Grouper		Tool transforms lists of up to 10,000 keywords into an organized keyword structure.
Keywrd Density Analyzer		Enter URL - Webpage stats PR/Links/W3C/etc.
Ontology Finder		Provides synonymous terms to keywords - Use these in your webpage text.

16.Link Popularity Tools (10) 

Backlink Anchor Text Analyzer		Blacklink analyzer that shows URL and anchor text.
Link Appeal		Enter URL - Rates for link appeal.
Link Popularity & Site Analysis Tool		Shows links/pages for Google/Yahoo/MSN/Ask/Alexa
Link Popularity Checker		Lists inbound links from 7 search engines & provides history.
Link Popularity Checker		Shows inbound links for Google, Yahoo, MSN, Altavista, Allintheweb & Hotbot.
Link Popularity Checker		Enter URL - Displays backlinks on 5 Search Engines.
Link Popularity Tool		Statistics regarding a site popularity
Link Quality Assessment		Shows IBLs, dir.yahoo, DMOZ, EDU, & GOV links.
Report Bot		Checks Links on 5 Search Engines, PR, Alexa Ranking, DMOZ.
Uptime Bot		Off-page (popularity) stats

17.Misc Tools (8) 

Adsense Ad Display		Input URL shows AdSense Ads for that web page.
Check Yahoo WebRank		Allows you to check the Yahoo WebRank of up to 5 URLs at a time.
Domain Directory Checker		See if your domain appears in 10 Internet Directory’s.
Search Engine Index Checker		Enter URL - Shows number of pages for 5 Search Engines.
SEO Tools		WordStreams suite of free keyword tools is the easiest way to improve the quality of your keyword research.
Site Wide Cache Check		Checks for cached pages and provides cache date.
URL Rewriting Tool		Creates Mod-Rewrite rules to convert dynamic URLs to static looking URLs.
URL Trends		Full page popularity stats

18.MSN Ranking Tools (2) 

MSN Position Search		MSN Search for up to 15 keywords on one domain.
MSN Rankings		MSN Beta Rankings - Search Engine Rankings.

19.Page Rank Tools (3)

Datacenter Quick Check		Checks datacenters for BL, PR and Ranking.
Future PageRank Tool		View PR during updates on 18 data-centers one screen one search.
Page Rank Tool		Shows PR on the differnet Google datacenters.

20.Pay Per Click Tools (2) 

CPM and CPC ROI Calculators		CPM and CPC return on investment calculators.
Overture Bid Amounts		Overture bid amounts for keywords

21.Related Page Rank Tools (10) 

Backlink Checker		Input webpage - Returns number of inbound links for each PR position.
Google PageRank Calculator		Input keyword - Shows PR and Backlinks.
Google PageRank Prediction		Looks at your URL and predicts PR
Google PageRank Report		Cut & Paste - Shows PR for unlimited sites.
Multi DC PageRank Checker		Check PR values across all Google datacenters.
Page Rank Grid Calculator		Construct the relationship of your website pages & calculate PR.
Page Rank Search		Google search results with PR bar and inbound links.
Pagerank Calculator		Mark Horrell’s Pagerank Calculator
PageRank Lookup		Cut & Paste - Shows PR of up to 100 URLs.
PageRank Search Prog		Displays Google by pagerank - IMPROVED Prog Tool.

22.Robots.txt Tools (2)

Robots.txt Generator		Creates simple robots.txt file.
Robots.txt Syntax Checker		Checks your robots.txt file for errors.

23.RSS Tools (0)

Feedburner by Google		check website or blog feed

24.Search Engine Position Tools (5)

Cool SEO Tool		G/Y/M/A ranking, pages, backlinks, allinanchor, & domain age.
McDar Keyword Analysis Tool		Enter URL/Keyword - Displays PR/Backlinks/Pages for top 10.
Page Report		Shows pages, BL, PR, unique domains etc.
Pages Indexed Backlinks Domain Pagerank Allinanchor Keyword Density Tool		Shows pages, BL, PR, Allinanchor, keyword density, etc.
PulseRank		Tracks Ranking movement on Google for 1000 keywords.

25.Text Link Ad Value Tools (3)

Keyword Difficulty Tool		Rates difficulty of ranking on Google for key phrase.
Link Price Calculator		Show value of text link ad.
Link Value		Calculates link value per month rental.

26.Toolbars (7)

Google Toolbar For Firefox		Download File - Toolbar displays PageRank has Google Search.
Google Toolbar For IE		Download File - Toolbar displays PageRank has Google Search.
Mozdev GoogleBar		Download Files - DL the Mozdev Googlebar and add the PR bar for both Mozilla and Firefox.
PR Toolbar Widget For Macintosh		Download File - PR Toolbar Widget for Macintosh.
Search MSN Toolbar		Download File - Toolbar for Beta MSN Search.
Yahoo Toolbar For Firefox		Download file - Toolbar for Yahoo Search.
Yahoo Toolbar For IE		Download file - Toolbar for Yahoo Search.

27.Track Ranking Tools (1)

Check Rankings

Graph view of Google rankings for keywords.

28.Web Site Optimization Tools (13)

Advanced Meta Tag Generator		Sophisticated meta tag generator.
Cache.it		Shows information lots of information for your site.
Code to Text Calculator		Enter URLs - Calculates Code to Text Ratio.
Copyscape		Searches for copies of your page on the Web.
Google Banned Tool		Shows if you are in the Google index.
Meta Tag Generator		Enter meta info - Creates meta tag code.
Meta Tag Generator		Creates meta tags for 9 tags.
Poodle Predictor		Use in Diagnostics View to see order of spidered text.
Search Engine Spider Simulator		Enter URL - Displays page content minus code.
Search Engine Spiders		Spiders your page and shows what the spider sees.
Similar Page Checker		Enter URLs - Compares pages for similar content.
Watchfire WebXACT		Checks over your web page for things to numerous to note.
Web Page Analyzer		Enter URL/Keyword - Checks copy for optimization.

29.Yahoo Ranking Tools (2)

Yahoo Rank Position		Shows Yahoo rank position, numbmer of entries indexed.
Yahoo Search Rankings		Enter URL/Keyword - Searches the first 1000 entries..

Data Source :  SEO Company