Google Adwords Keyword Research Tool alternatives

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Which is the Google Research Tool that you will prefer as an alternative of Google Adwords Keyword Research Tool ??

Wordtracker
Google Trends
Good Keywords v3
SEMRush
Free Search Term Suggestion Tool by Trellian
KGen
Wordpot Free Keyword Tool
NicheBot Classic
Thesaurus
Delicious
Keyword questions
MetaGlossary
Or, any else keyword research tool

Share your experience with us.