Azendoo is a nice service designed to help teams divide and track project responsibilities. In Azendoo you can invite people to join a workspace in which all of you can create tasks, assign task due dates, and send messages to each other. Creating tasks is a simple matter of filling in the "task" field and choosing a due date.
Azendoo allows teachers and students to have as many workspaces as they need. Each workspace provides 10GB of storage. Azendoo works with Evernote, Google Drive, Dropbox, and Box so that your team can share materials from those accounts.
Applications for Education
Azendoo could be a good tool for high school and college students to use to organize long-term group projects. After they plan and assign tasks students can use Azendoo to send reminder messages to each other.