Turbo Website Reviewer helps to identify your SEO mistakes and optimize your web page contents for a better search engine ranking.
Demo: https://codecanyon.net/item/turbo-website-reviewer-indepth-seo-analysis-tool/20069330
Comment Tools Pro adds an arsenal of practical tools for your WordPress Blog’s comment section. UpVote / DownVote comments is also supported.
Demo: https://codecanyon.net/item/comment-tools-with-sentiment-analysis/22883825
SEO Propeller (just updated Sept 2020) wordpress plugin allows you & your visitors to generate full onpage seo reports for any given URL and Keyword combination!
Demo: https://codecanyon.net/item/wp-seo-propeller-advanced-seo-analysis-tool/20921178