LXer: Have you heard of ONLYOFFICE? It’s like Google Docs, only it’s not from Google … and you might
 

Published at LXer:

How could I have missed ONLYOFFICE? If not for a How to Forge article on installing it, I would have never known that it existed as a hosted alternative to Google Docs/Spreadsheets or that you can self-host the software, though I’m not sure how functional the roll-your-own version is at this point.

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I had never heard of this, checked out the personal edition (the older version), and I have to admit, it's extremely useful looking. Will be playing around with it a bit.