Todd, as a Wealthy Affiliate member, I have known about Jaaxy for a while, but never fancied spending the membership money whilst I had access to the keyword search tool offered by Wealthy Affiliate. However, I have now started piloting Jaaxy on the first 30 free searches, and boy if you are right! It is truly a powerful tool, which not only enables a genuine keyword search which reflects Serp ranking on the major SEO (and I have tested this myself by ‘playing about’ with keywords on these platforms), but it also offers website ranking, which for the same price you never find on alternative keyword search tools available on the market. To me, this in itself is a winning combination – definitely worth the upgrade to Pro membership!
I think people's aresenal of keyword research tools are mostly the same: 1) You need a tool to examine search volume, most likely Google Keyword Planner 2) A tool to help you generate more keyword ideas. Tools that work with the search engines' autosuggestions are very popular such as and Ubersuggest 3) Then people might add a tool broaden the depth of their data, maybe including something like Google Trends or Moz's Keyword Difficulty tool.
Of all the tools listed in this article, Moz Link explorer is an old one & quite popular.  If you want to compare backlinks between two or more domains, Open Site Explorer is worth trying. This tool works best when you have a paid account of SEOMOZ though a free version of this tool is good enough to get you started checking the backlinks of your site and the sites of your competitors.