AdWords Keyword Planner is a keyword focused SEO tool from Google that provides keyword ideas and traffic estimates to help you build a Search Network campaign. You can search for keyword or ad groups ideas based on terms that describe your product or service.

SpyFu allows internet marketers to analyze and download their competitors' most profitable keywords and ads for paid and organic search. 

It allows you to search for any domain and see everywhere they've shown up on Google. This includes  keywords they've bought on Adwords, every organic rank, and every paid ad in the last 9 years.