Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Jackmail - A newsletter plugin for Wordpress.
Clever - syncing between education applications for K-12 schools
Wordfence - Comprehensive security plugin for WordPress.
Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.