adwords.google.com/keywordplanner
semrush.com
ubersuggest.org
google.com/trends
keywordtool.io
longtailpro.com
These are all good for the keyword analysis

Will try your suggestion, though currently i was using google webmaster and adword. But i do personally think that they are not meant for that purpose. Adwords is meant for advertisement and not keyword research though people use it for that purpose.By the way do you know any tool that can tell on which page is my site listed with any particular keyword.That would be very helpful.

nice thank you i got lot of information here.

I also use Google Adwords for Keyword Research. Easy because it show the best keyword and competitor keyword research