Workzone - Workzone is a web-based project management software.
Project Panorama - Project Panorama is an elegant and reliable WordPress manager plugin that comes with exciting features and tools that will allow managing your multiple WordPress sites with ease.
iBE.net - Your Business in the Cloud
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