It is an easy to use Xoops modul for project management. It supports subtasks and comments, but doesn’t include every feature possible. It remains small and handy. Just add a project, add a task and have an overview what’s going on in your project.
Teamwork is an integrated, web based work management solution built purely in Java on the Hibernate persistence layer. It integrates project, time and worklog management. Import/export from MS-Project, Basecamp and Outlook/Icalendar SVN & Tweet synch.