Entering a book you wrote into the public domain?

1

Standard Ebooks

It's not quite what you're asking, but take a look at Standard Ebooks. They've been publishing really nice editions of public-domain ebooks, though usually books that fell out of (or were never in) copyright.

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2

Creative Commons

Finally, if you haven't already, you might look into Creative Commons, who say they "sustain the thriving commons of shared knowledge and culture." That's not a platform, but rather a framework, and might be more useful/interesting than pure public domain.

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