Semrush: Its standout features are its link building and site auditing tools; the former gives you an excellent 'CRM' style method of building backlinks and the latter gives you a super-easy checklist of ways that you can improve your technical and on-page SEO.
Long Tail Pro
In my Long Tail Pro review I will show you how to do keyword research to discover easy to rank for terms using the best keyword research tool on the market.
KWFinder is one of the best keyword research tools out there. It's got a seamless interface, powerful features, and beautiful design, which makes it a great choice for beginner bloggers. But veteran webmasters can also find value in it.