Free SEO Keyword Tools - Google Keyword Tools

Figuring out your keywords or key phrases is an essential task for effective search engine marketing or search engine optimization. Here are some of my favorite links to tools, overviews, and other Internet resources for helping you to brainstorm your keyword list.

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The 30 Free SEO Tools You Must Know
Recently a "101 free SEO Tools that don't suck" list went popular on Sphinn. I love 101 items lists and I love free SEO tools especially if the tools "don't suck". While checking out the list I've encountered some tools I haven't been using much or been familiar with at all. On the other hand I was missing some tools I use daily. When I noticed that the list actually contains SEO tools that measure the so called keyword density I finally...
  http://www.seoptimise.com/blog/2009/07/the-30-free-seo-tools-you-must-know.html

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Keyword Spy
KeywordSpy currently operates in USA, United Kingdom, Australia and Canada. Through this keyword tool and keyword software, you can perform advanced keyword research and keyword tracking to study what your competitors have been advertising in their Adwords campaigns and Other PPC campaigns. You can now get complete in-depth analysis, stats, budget, affiliates & ad copies of your competitors.
  http://www.keywordspy.com/

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Trellian Keyword Discovery
Keyword Discovery compiles keyword search statistics from all the major search engines world wide, to create the most powerful Keyword Research tool. Over 80% of all online transactions begin with a keyword search. To compete, you need to target all the relevant keywords. Keyword Discovery can tell you the search phrases people use to find products and services, as well as the search terms that drive traffic to your...
  http://www.keyworddiscovery.com/

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Wordtracker.com
Andy Mindel and Mike Mindel created Wordtracker in 1999 to answer a fundamental question in the search engine industry: 'What are people searching for on the Web?' Wordtracker helps website owners and search engine marketers identify keywords and phrases that are relevant to their or their client's business and most likely to be used as queries by search engine visitors. Marketers can also determine how many competing sites are...
  http://www.wordtracker.com/

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Wordze's Keyword Services
Wordze's premiere collection of keyword services allows you to quickly find new keywords to target and analyze search competitiveness.
  http://www.wordze.com/

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Google Insights for Search
See what the world is searching for with this free tool from Google.
  http://www.google.com/insights/search/#

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Google Keyword Tool
If you are setting up a pay-per-click advertising campaign, and/or working on your own SEO strategy, this free tool from Google is very helpful. Enter a keyword and Google will show you the number of recent searches by that keyword as well as related keywords, by which you can determine adjacent interesting keywords for your efforts.
  https://adwords.google.com/select/KeywordToolExternal

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Google Search-based Keyword Tool
Google will spider your website and give us suggested keywords also vis-a-vis your AdWords Account.
  http://www.google.com/sktool

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Google Trends
Use Google's interface to monitor keyword trends!
  http://www.google.com/trends

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Keyword Envy
Track Google ranking, Yahoo ranking, Bing ranking & more! KeywordEnvy is a tool for keyword ranking reports & analytics. Help and Support Login Register Home Check Your Website's Search Engine Ranking
  http://www.keywordenvy.com/

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Keyword research tool
SEOBook in partnership with Wordtracker produces this free keyword research tool. Useful to help you think of a good keyword / keyphrase list.
  http://tools.seobook.com/keyword-tools/seobook/

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Rank Tracker
Sign up for a free account, and you can use this tool to track your rank on Google.
  http://www.seomoz.org/rank-tracker

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SEOBook - Firefox Rank Checker
Subscribe for free and download this fantastic rank checker tool for FireFox.
  http://www.seobook.com/download-your-free-seo-tools/