"Philologus is designed by teachers for teachers and allows them to create customised interactive versions of popular games suitable for use during lessons."
""This document text is synchronized as you type, so that everyone viewing this page sees the same text. This allows you to collaborate seamlessly on documents in your Web browser." A collaborative writing tool. No directions given until you start a new document.
Although the home page looks like it's for children, the text is really fairly complex, so high school or adult is more appropriate. Offers suggestions on point of view, reviews, summaries, etc. A sophisticated mind-mapper.