Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
AffiliateWP - A powerful affiliate marketing solution for WordPress.
Jackmail - A newsletter plugin for Wordpress.
ReferralMagic - Turn your users and customers into referral magnets.
Wordfence - Comprehensive security plugin for WordPress.
Everflow - Partner Marketing Platform - Track, Analyze & Automate