SE Ranking
Here is a great SEO tool that is offering 30% 
off for the next two weeks.
They also have a introductory trial period so you can give it a try before you buy.
Features:
Keyword grouper
Save time on grouping selected keywords to distribute them effectively and efficiently among webpages of your sites
Competitor research
Discover what keywords your competitors are using in their ads and to generate organic traffic. Spy on their budget, traffic, and the amount of clicks on their ads and even see how the ads look like
Backlinks monitoring
That’s what this feature is about – to know everything about your backlinks so you can act accordingly
