Wordpot Free Keyword Tool. Enter a keyword and get the 50 most popular keyword listings, as well as additional keyword information. Get 20 daily keyword searches by signing up for an account.
Soovle. Soovle is a keyword research tool that compares the amount of queries between 7 major websites and presents the results in a visually appealing layout..
Google Correlate. Google Correlate finds search patterns that correspond with real-world trends. You can also enter a query to find search terms that have a similar pattern of activity historically. Or find terms that match the dataset of a location.
Yahoo! Search Clues. Find out what people are searching for on Yahoo! Trend analysis gives where and when information on searches. Compare trends between search terms.
Rank Checker. Rank Checker is a Firefox plugin to get rank information on any search engine results page (SERP). Enter chosen keywords and domains, and Rank Checker will pull information from your specified search engines and tell you which page is being ranked.
NicheBot Classic. Type a keyword or phrase and get the top 50 most popular keyword listings.
SEOquake. SEOquake is an extension for Mozilla Firefox browser, which allows you to look through different search engine parameters on the fly. Along with a large assortment of other tools, it offers a tool to analyze keywords frequency and density.
Keyword Typo Generator. Use this tool to generate a list of typos and common misspellings for AdWords ads and domain names. This software and script should help you in the generation of low competition keywords.
Keyword Questions. Find the popular questions people are asking in your market. Target long tail keywords and provide content that readers want to read and link to.
Trendistic. Trendistic provides a historical chart — up to 180 days — of trending topics in Twitter. Enter a term and see its trend. See what topics are hot.
Synonym.com. Synonym.com provides synonyms, antonyms, and definitions. Type in a word and the synonym finder will come up with a list of synonyms. It also lists the most popular online synonym searches.
MetaGlossary. MetaGlossary harvests definitions from the entire web. It extracts the meanings of terms and phrases from the mass of information on the web. MetaGlossary organizes these meanings based on topic and usage, defining even your most field-specific jargon.