Tools to find, analyze and list keywords used in PPC and SEO campaigns.
Bing Keyword Research Tool – What people are searching for on Bing. Requires signup/in.
Google Adwords Keyword Planner – Keyword suggestion tool for Adwords campaigns. Requires signup/in.
KGen – Firefox addon, highlights the number of times a keyword is found on a page, use on competitors to see which terms they are focused on. No charge.
Keyword Tool – Tool pulls keywords from Google, Bing, YouTube and The App Store related to the phrase you search on. Does not provide the number of times a keyword has been searched for, just variations of a search phrase. Tip: Since YouTube pulled their keyword search tool, this is a great way to see what people search for on YouTube! No charge.
Keyword Shitter This tools scrapes Google Suggest and brings back a mountain of phrases after you seed with your main terms. No charge.
Keywords Everywhere A Chrome or Firefox add-on that adds Google search volume, CPC and competition data to tools such as Ubersuggest, Soovle, Answer the Public, Keyword Shitter, Majestic Anchors, Google Analytics and more. Requires an API they issue, the tool is free to use but they ask for a review on Google and Firefox.
MergeWords – Free tool allows you to insert up to three keywords into boxes that merge the terms and return lists of suggested keyword terms you can use in domaining, for link building or Adwords. Very useful.
Moz Keyword Explorer – Retrieves top 10 ranking for a term, assigns a Difficulty Score based on pages currently ranking for the term. Provides search volume data for terms, part of Moz Pro program offers 30-Day Trial.
SECockpit A web-based research tool, does not depend on you having an Adwords, Moz or any other account. Pulls information from Google Suggest, Amazon Suggest, YouTube Suggest and “related search terms” (bottom of Google). Detailed training manual, videos, and tutorials.
SEMRUSH – Keyword research tool shows paid and unpaid traffic, what terms you are ranking for, which terms competitors are ranking for, traffic by country, what keywords competitors use in Adwords campaigns. Shows related terms, lists URL’s ranking for specific terms, everything can be downloaded. Free components such as Domain Comparison and basic Keyword Word checker, three paid plans.
SEOBook Keyword Tool – Offers rough suggested monthly and daily search volumes by market for Google and the Bing-Yahoo! search network. Also, provides links to price estimate tools from Google Adwords, links to Google Trends/suggest/synonyms as well as Yahoo! Suggest. Requires signup and login to use.
SERPS Keyword Research Look for a high-value keyword, filter by volume, CPC, by value or alphabetically. Free to use.
Soovle – Input a keyword and this tool pulls the most typed keywords from sites and search engines such as Google, Bing, Wikipedia, YouTube, Amazon, etc. No charge.
SpyFu Shows keyword intelligence by domain, enter URL and see which terms are they are ranking for, terms they use in Adwords campaigns currently and for the last six years. Three paid plans offer a 30-day guarantee. 
Übersuggest – Keyword research tool uses Google Suggest plus other suggestions services to return lists of suggested terms. The tool allows you to look at results in Google verticals such as Video, Images and News and from specific countries. No charge.
WordStream Keyword Tool – Keyword suggestion tool, pulls from a database with over 1 billion unique terms. No charge.
Wordtracker – Returns keywords recently typed into search engines, lists long-tail options, provides 2000 keywords per search. Allows you to watch the competition and lists a KEI (keyword effectiveness) score. Free trial, three paid options.
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