http://www.longtailfinder.com/
https://kwfinder.com/
http://www.keywordrevealer.com/keyword_tool.php
seocentro keyword-suggestion tool
http://ubersuggest.org/
for Google keyword and Youtube:
http://keywordtool.io/
http://soovle.com/
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Keyword Mapping tool:
https://www.text2mindmap.com/
How to + keyword
7 ways to +keyword
top 10 tips + keyword
Keyword Research + Competitor Analisis Software SKR Download below:
http://pcsoft24.com/simple-seo-keyword-research-tool/