SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
Jetpack - Jetpack offers SEO and security plugins for Wordpress.
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.
Project Panorama - Project Panorama is an elegant and reliable WordPress manager plugin that comes with exciting features and tools that will allow managing your multiple WordPress sites with ease.