Free Keyword Analysis Tools

Can anyone recommend a free or almost-free Keyword analysis tool?
Every year or two I want to do a little keyword/phrase research for SEO purposes.
I used to use Google's Keyword Tool but can't seem to find it.
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented: - Once logged in, click on the wrench icon at the top right, then select keyword planning tool.

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Jigar ShahCo-FounderCommented:
All of the tools I reviewed for this Answer are free.

1. Google AdWords: Keyword Planner
2. SERPs Keyword Research Database
3. Wordstream Keyword Tool
4. KeywordEye
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