"Redmine is a flexible project management web application. It is cross-platform and cross-database.
Redmine is open source and released under the terms of the GNU General Public License v2 (GPL).
Features
Some of the main features of Redmine are:
Multiple projects support
Flexible role based access control
Flexible issue tracking system
Gantt chart and calendar
News, documents & files management
Feeds & email notifications
Per project wiki
Per project forums
Time tracking
Custom fields for issues, time-entries, projects and users
SCM integration (SVN, CVS, Git, Mercurial, Bazaar and Darcs)
Issue creation via email
Multiple LDAP authentication support
User self-registration support
Multilanguage support
Multiple databases support"
"Silverpeas is an Open-Source Collaborative and Social Web Portal mainly used by our users to build an Intranet or an Extranet. The key words of Silverpeas are collaboration and social network. Atop of a collaborative bus and a social network engine, about 30 ready to use applications are freely available to share documents (EDM Electronic Document Management), to streamline project management, to manage content (CMS), and to optimize the management of knowledge and skills.
Among the ready to use applications, you can find: EDM, Pictures Gallery, directories, calendars, workflow, forms, blog, wiki, forums, project management, and so on. It offers also a non-technical mechanism of delegation of rights and a powerful transverse taxonomy mechanism, that is coupled with the search engine, enable users to find rapidly the information they are looking for."