Keysearch is a paid-for research tool that provides much more than the usual regurgitated Google AdWords Keyword Planner data. You can do that, of course, but you also have access to YouTube search data, (also provided by Google, of course), Amazon, Ebay and the publishers own extensive database. In addition to keyword research you also have a handy rank tracking tool and a competitor analysis function. Great value @ $23.80 for the basic "Pro" plan.
The best thing about this package, for me, is the presentation. Check out the Free Trial and see for yourself: [https://www.keysearch.co/user/register]