Workzone - Workzone is a web-based project management software.
Jetpack - Jetpack offers SEO and security plugins for Wordpress.
Milestone Planner - Visual project planning tool. Powerfully simple. Quickly build and share professional milestone plans on-line to track deliverables - Free sign up.
WP User Manager - The most customizable profiles, community builder and membership WordPress plugin
Xebrio - A Project Management Software to Fulfill Your Story From Requirements to Deployment.
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.