Online+Word+Processors

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 * When Google Docs became Google Drive, the school filters began blocking it as a "filing sharing" service. If you're blocked, try going to the Google Docs front page directly from Google search (not your gmail account) and you should be fine.***

ThinkFree
an online collaborative word processor with Microsoft Word compatibility and now mobile functionality with both iPhone and Android apps. []

Zoho Writer
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Etherpad
this is strictly an open source code link as Google bought Etherpad and the code was released by the designers to anyone who would like to host Etherpad servers. Hopefully a few competing servers will appear out of the mist as this is a great word processor with live chat features in addition to the collaborative word processing. []

Written?Kitten! This is the carrot half of the carrot and stick method of writing. Every time you pass a word count (that you can set yourself), you get a fresh kitten picture! []