Jetpack - Jetpack offers SEO and security plugins for Wordpress.
Codezero - Collaborative Local Microservices Development
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
LeadMD - LeadMD is the revenue performance consultancy that cuts through the BS by making your vision actionable and your outcomes measureable
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.
Sirius - An open-source clone of Siri from UMICH