As a part of kicking off our development, we started using a basic project management system thats built into wordpress however it lacks 99% of the functionality that we really need for distributed project planning, management and development. If any one can weigh in on options here for a underlying project management system thats free for OSS developers, open/transparent for users and easy to use at the same time we would love to know!
Ohhh! Thanks for letting us know how is the development of Jahshaka 3.0
Well there’s always Sourceforge and another one built for Open Source projects with multiple people working on it, but I can’t remember the name, it’s not extremely popular though.
might worth Looking at this Agile:
https://seenowdo.com/index.xhtml
I have been looking forward to being able to use the new jahshaka. Now I see that it is still under development
Anyway, where are you hosting your development? SourceForge? GitHub? They all have built-in project management capabilities (like tracking issues, milestones, bugs, etc. etc.) Your best bet is to check out what they have available, or whereever you are hosting your source code.
You might just trying adding BuddyPress to the WP installation. That would give you groups. There are also numerous extensions for both WP and BuddyPress for document management, event scheduling etc. For bug tracking, I have always liked Mantis.
I just wanted to add that on SourceForge, with your project, you also get a wiki, a mailing list, forums. GitHub might offer all these things as well (at least it has a wiki that I know of) while I think Google Code’s functionality is a bit more sparse. Anyway, check it out, I think you will find all the functionality you need there.
http://openatrium.com/ is the way to go –I think
. However, giving more details on what you want (the other 99%) would help a lot in helping you 
http://www.atlassian.com/opensource/
from here, you can apply for free opensource license
for the following products:
JIRA + GreenHopper + Bonfire
Confluence
Crowd
Clover
Crucible
FishEye
Bamboo
SharePoint Connector for Confluence
Confluence Team Calendars
ever looked up joomla? i know it’s essentially WordPress, but much much more powerful, with all the extensions you could easily create a forum type of section on the site, based on what group you’re a part of… if that makes since. but you have to have a webhost to use it (such as Bluehost)
open source project management apps… – (courtesy of my internship sponsor – Chuck Johnson – “Big Bad Wolf Creative Group” Fort Worth Texas.)
http://mastersinprojectmanagement.org/top-25-open-source-project-management-apps.html