Similar concepts are found with Penflip (http://www.penflip.com) that go outside... | Hacker News

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		rhgraysonii on April 4, 2014 \| parent \| context \| favorite \| on: Show HN: GitBook – Build beautiful programming boo... Similar concepts are found with Penflip (http://www.penflip.com) that go outside programming but offer similar functionality, depending on the breadth of what you may want to write on.

reillyse on April 5, 2014 [–]

I'm a big fan of penflip. Create for collaboration and got some neat features for editing your books.

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