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Here is a comparison of some key features of the current three top offerings from Scientists, [Authorea](http://authorea.com), [writeLaTeX](https://www.writelatex.com), and [shareLaTeX](https://www.sharelatex.com).  (insert table, to be created, here--**Alberto**--can you do that?) that? columns are the three products-- rows should surely include: LaTex, Reference Handling, Markdown etc., code support, interactive figures, audio, video, version control, offline syncing/dropbox integration, etc.)  **Josh**--should we discuss business models for these services? Mention that open shared papers are free? Talk about Universities and/or Journals having special, customized, subscriptions?