Irayo!

Google Webmaster Tools provides you with detailed reports about your pages' visibility on Google. See how Google crawls and indexes your site and learn about specific problems we're having accessing it. View, classify, and download comprehensive data about internal and external links to your site with new link reporting tools. Find out which Google search queries drive traffic to your site, and see exactly how users arrive there.

SEMRush is competitor research keyword tool with a regularly updated database of over 88 million of the most expensive keywords used to drive traffic to websites through Google Adwords and Google’s organic search results. You can use SEMRush to identify organic search and AdWords opportunities, as well as seeing which keywords are driving the most traffic to your competitors.

KWFinder - Find long tail keywords with low SEO competition.

Discover thousands of long tail keyword suggestions from Google, Yahoo, Bing, Kindle and much more. Long Tail Keyword Suggestion Tool, Best Free Alternative to Google keyword tool.