Standard Ebooks
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Great source of classics and other public domain material that have been formatted and edited for consistent readability, compatible with just about any eBook reader. Iβve read several books from here and theyβve all looked great.
All their eBooks are edited and proofread manually by volunteers, not just auto-converted. I edited one book for the project to see what was involved, and their contributor guidelines are very exacting.
More info at Standard Ebooks.