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

Adds a simple issue tracking system to your WordPress blog.

Adds a full issue tracking system to your WordPress blog.

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

A complete Project Management & Task Management plugin for WordPress. Taskbuilder is a modern, easy to use project manager with lots of free features.