Keyword Research Tools
The following keyword research tools will allow you to find search volume, trends, demographic information, related keywords and common typos of keywords.
Google Adwords Keyword Tool
https://adwords.google.com/select/KeywordToolExternal
Google Trends
http://www.google.com/trends
KeywordDiscovery Suggestion Tool
http://www.keyworddiscovery.com/search.html
Microsoft Keyword Forecast
http://adlab.microsoft.com/Keyword-Forecast/
Microsoft Keyword Mutation Detection
http://adlab.microsoft.com/Keyword-Mutation-Detection/