Appsero - Appsero is a killer WordPress Analytics, Licensing & Deployment Tool. Appsero is the perfect companion for WordPress plugin & theme developers.
Free SEO Checker by Spotibo - An SEO checker that analyses based on Google's algorithm 👀
Squirrly SEO Focus Pages - Waze for navigating Google Ranking factors
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
Freemius - Freemius is a suite of solutions for monetization, analytics, and marketing automation for freemium and premium WordPress plugins.
SEO Minion - Chrome extension & Firefox add-on to help you with SEO