John

This plugin enables you to manage your projects from the WordPress interface you are already comfortable with. Easily create and track the progress of projects and tasks.

WP-Trac

This plugin allows users to manage projects and tasks.

wppal

iProject Web is a feature rich and easy to use project management and task management software. It helps to organize effective project team communication and project document tracking.
Features:
<ol>
<li>Task status tracking</li>
<li>User and role management.</li>
<li>Task history tracking</li>
<li>Risk management.</li>
<li>Email notifications.</li>
<li>Mailing lists.</li>
<li>Advanced file management</li>
<li>Different styles for admin and front-end parts of the site.</li>
<li>Lightweight ajax design</li>
<li>Knowledge base.</li>
<li>Custom fields.</li>
<li>Online help system.</li>
<li>Advanced GUI.</li>
<li>Advanced data filtering.</li>
<li>Advance data navigating.</li>
<li>Suggestion lists and quick information windows.</li>
</ol>
<blockquote>
!!! Important !!! 
 For those who upgrade from iProject Web 1.0.x.x version. 
 1. Please notice your file folder name found at iProject Web -> [Application ]Settings -> File Folder 
 2. Manually copy all the files from the ‘files’ folder to [wp-content]/plugins/iprojectweb_templates/’files’ folder
</blockquote>

Easy Project

Easy to use yet powerful project management tool

WP-Trac vs Easy Project