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The easiest way to work with someone else on a document. Kivo is a plugin that makes it incredibly easy to edit a document with other people. It allows you to share edits and store versions of a document without ever leaving your editing application - eg. PowerPoint.

Priceonomics is the price guide for everything. Price guides are helpful for buying and selling used things. How much should I spend on this used bicycle on Craigslist? How much should I sell my stereo system for on eBay? Is this used Vespa a good deal, or what?