Teambox is a project management and collaboration web application. It lets the user take care of task planning as well as the sharing of information among team members, the confection of mailing lists, and related issues. Note that this application is free to begin with, and there is no limit to the number of projects that you can create at the same time, nor the number of people that can take part of them concomitantly. Notes can be created for everybody to edit and stay updated on the way the project is shaping up, and learn about new priorities as they come along. These notes also support text and media attachments. The user interface is very intuitive and clean. Being open source, you can also install it in your server to completely customize the interface. Of course, being open source also means that it can be expanded by the community in the ways that it sees fit. All in all, a very good tool for online collaboration and the development of projects. Put it to the task by following the provided link and see where does it stand for you.