SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Jetpack - Jetpack offers SEO and security plugins for Wordpress.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
UpStream Plugin - UpStream Plugin is a free-to-use project management plugin that allows you to manage various types of projects right from your WordPress site.