Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
SEO Content Editor - Write and optimize site’s content based on SERP data
Screpy - Screpy is a web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).
SEO Writing Assistant by SEMrush - Content optimization on the go
Rank Math SEO - A FREE powerful and lightweight SEO plugin for WordPress
SEO Ebook by WiziShop - Get insights from some of ecommerce's most renowned SEO experts and increase the sales of your online store.