Jetpack - Jetpack offers SEO and security plugins for Wordpress.
AskNicely - Collect customer experience feedback on a daily basis and empower your team to take immediate action to drive retention, upgrades, reviews and referrals.
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
Delighted - The fastest and easiest way to gather actionable feedback from your customers
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.
Survicate - Collect feedback on your website and find out more about your visitors.