Keyword LSI Spy 2 seems interesting, three tries for free. Kinda scary disclaimer “Disclaimer:
Keyword LSI Spy initiates its analysis by automatically retrieving search results from the search engines. This is frowned on by some search engines and can result in your domain’s IP address being blocked. Keyword LSI Spy is not recommended to be installed on domains that are important to you and any use is at your own risk.”

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