Webmaster Toolkit's Spider Simulator Tool (Our Favorite)
http://www.webmaster-toolkit.com/search-engine-simulator.shtml
This tool shows you how a web page would look to search engine spiders. Search Engine World's Keyword Density Tool (Our Favorite)
http://www.searchengineworld.com/cgi-bin/kwda.cgi
This tool is a keyword/keyword phrase density analysis tool.
Jim Tool's Keyword Density Tool
http://www.jimworld.com/tools/keyword-analyzer/
Tool supplied by ranks.nl. Doesn't need a keyword. Analyzes page in general for overall weight.
Keyword Density and Prominence Tool
http://www.ranks.nl/tools/spider.html
This tool calculates the keyword density, page's headers, page elements, outgoing links and more. It warns when it detects possible stopwords, adult words and 'poisonwords'.
Webjectives.com Keyword Density Analysis Tool
http://www.webjectives.com/keyword.htm
This tool measures the optimum density of keywords which appear on a web page.
Overture Keyword Suggestion Tool
http://inventory.overture.com/d/searchinventory/suggestion/
This tool generates keyword popularity by the number of times that a keyword was searched in the overture database the previous month. It also displays related terms and their popularity too. Please note: This link doesn't always work and is not always current.
WordTracker Keyword Research and Popularity Tool
http://www.wordtracker.com
This tool helps you find all keyword combinations including misspellings that bear any relation to your business or service. It also checks each keyword for usage popularity; the number times that a keyword was searched.
WordTracker Articles
http://www.wordtracker.com/articles/
SearchSpell
http://www.searchspell.com/typo/
Misspelled words finder tool. Obtain a list of commonly misspelled words that apply to your topic or your targeted keywords/keyword phrases.
Keyword Extractor Tool
http://websearch.about.com/
Enter a URL and this program will return a list of the primary keywords on a web page.
Keyword Density Analysis Tool
http://www.keywordcount.com
This tool gives you a general idea of the frequency with which keywords appear on a web page.
Mike Scott's Web
http://www.liv.ac.uk/~ms2928/
This is lexical analysis software for data-driven learning and research.
VBPro text link Analysis
http://excellent.com.utk.edu/~mmmiller/vbpro.html
Programs that do text link analysis, create lists of words in a file along with their frequency in alphabetical order or in descending order of frequency and find and tag key words and phrases in context.
Lexical FreeNet
http://www.lexfn.com/
This free service produces drill down lists of synonyms of words.
Atlas.ti
http://www.atlasti.de/index.html
Software program that helps you to uncover the complex phenomenons hidden in your data in an exploratory way.
Web Page Theme Inspector
http://www.searchengineworld.com/cgi-bin/sim_spider.cgi
This tool is a spider simulator; it shows what your webpage looks like to a search engine spider.
Google Dance "The Shakeout"
http://dance.efactory.de/
What is the "Google Dance" exactly? Markus Sobek has written a fabulous piece on the "Index Update" of the Google Search Engine.
Google supports several advanced operators
http://www.google.com/help/operators.html
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