sistemas para gerenciamento de projetos opensource

Collabtive http://collabtive.o-dyn.de/ (php)

ProjectPier http://www.projectpier.org/ (php)

Redmine http://www.redmine.org/ (ruby)

Opengoo http://www.fengoffice.com/web/community/downloads.php (php)

DotProject http://www.dotproject.net/ (php)