Collabtive – Multi-Language Project Management
http://collabtive.o-dyn.de/index.php?lang=en

Collabtive is web-based groupware to get your projects done! Features include: 1) Easy to use, 2) Projects, Milestones, Tasks lists, Tasks, 3) User management, 4) Message system, 5) Integrated instant messenger, and 6) Multi-language. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.