Paradigm Online Writing Assistant
http://www.powa.org/

POWA

Abstract:

Whether you have an assigned subject or choose your own, you need to get focused and engaged with the project. Assigned subjects may look limiting at first, but they offer plenty of room for individual expression. Open subjects, while promising great freedom, can be daunting because they don't provide direction. They leave it all up to you. Yet these two situations, different as they appear, present similar challenges.