A review of an SEO tool called Ubersuggest. Basic performance is steadily developing, cost-effectiveness is the best in the same industry, and it is a tool that I like because it supports multiple languages.
This is a review of the editorial calendar called CoSchedule. Unlike other calendars, it is good for writing, especially for use in blogs such as WordPress, but I'm not sure if it is really differentiated in terms of functionality.
There's a web service and WordPress plugin called Headline Studio that scores your headline SEO. It's a bit of a bang for the buck, but it's definitely a tool you need, and if you're serious about blogging, it's a tool you can't live without.