The best keyword research tools that we can use are:-
Ubersuggest
Search Term/Query Reports
Google Keyword Planner
WordStream’s Keyword Tool
Competitor Source Code

For me the best one is the one, which I got from SEOclerks. You can check there too.

Best keyword research tools are: SEMrush, Keyword Discovery, KeywordSpy, Ubersuggest, Google Keyword Planner. I had used keyword planner and ubersuggest.

Of course, I vote for GG keywords planner. It's really convenient.

Google keywords planner is good.But earlier version was very good

Thanks for sharing this information. :D

google Adwords...

google keyword planner will do

and many other sites are online

Yes..Obviously keyword planner stands at first place and long tail pro also works good