UpStream is a free but very powerful project management plugin for WordPress.

Mantis Bug Tracker Bridge is a plugin that integrates the powerfull Mantis Bug Tracker software with Wordpress.

A lightweight issue tracker built entirely inside WordPress, designed for developers and agencies managing client projects.

TeamPress is project management & collaboration software, made the WordPress way.

A simple Pivotal Tracker frontend for Wordpress.

Present issues from The Bug Genie in your Wordpress blog.

This plugin for Wordpress 2.8 and above allows you to insert a simple table listing of issues from a Mantis Bug Tracker into a wordpress page or post.

Visual feedback and bug tracking for WordPress. Capture, assign, and fix issues without leaving your site — no more chasing reports.