Long Tail Pro

https://longtailpro.com/

Raven Tools

https://raventools.com/

Keyword Snatcher

http://keywordsnatcher.com/

Ahrefs Keywords Explorer

https://ahrefs.com/keywords-explorer

Keyword Discovery

http://www.keyworddiscovery.com/

Keyword Project Manager

http://keywordprojectmanager.com/

Keyword Eye

http://membership.keywordeye.com/

Concentrate

http://www.concentrateme.com/

FreshKey

http://freshkey.com/

Good Keywords

https://goodkeywords.com/

www.brandfuge.com/keyword-research-tools

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Best keyword research tools 2017