AWeber - AWeber is an Email marketing software that's easy to use. Send email newsletters & autoresponders and deliver top notch emails.
Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
Wordfence - Comprehensive security plugin for WordPress.