The German Collabtive is an online project management platform. It’s Open source and free to download. Logistically it works similar to other project management apps out there. It helps you form a group, keep track of changes, and delegate tasks. Main features include projects, milestones, tasklists and tasks. It’s got multiple language support and you can even upload your own. Users can also upload their own customized themes. It’s incredibly simple to install and there are no additional reqs. Currently version 0.2.5 is available for download. You'll need PHP 5 or higher, Apache and MySQL to download it.