GodModeReader
One word at a time, in one spot. Keep your eyes on the red letter and let the words come to you. Start around 300 words a minute and push the speed up until it feels a little too fast; after a minute it will not. The slider on the right widens your view, showing short words together, so you take in more at each glance.
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Public-domain books, fetched from the sites that publish them.