Jetpack - Jetpack offers SEO and security plugins for Wordpress.
Rock RMS - Rock RMS is a community supported open-source Church Management System that provides innovative features to churches of all sizes.
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
eCatholic - eCatholic provides a total content management system that helps Catholic parishes, ministries, & dioceses create websites & website design.
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.
ChurchInsight - ChurchInsight is a church website content management system (cms). It allows churches to have great church websites and the best church website designs.