Zoho

At the Instructional Technology Council's eLearning conference this year, Barry Dahl gave a talk about Zoho, a suite of free online tools.  You can get an account at https://www.zoho.com/.  There are a lot of nice features including a document writer, wiki, spreadsheet, chat etc..  The document application will save in a wide variety of formats and automatically shares on the web, which can be helpful for online instructors who could update from Zoho and link to the document in Moodle.