“Standard Ebooks is a volunteer driven, not-for-profit project that
produces new editions of public domain ebooks that are lovingly
formatted, open source, and free.
Ebook projects like Project Gutenberg transcribe ebooks and make them available for the widest number of reading devices. Standard Ebooks takes ebooks from sources like Project Gutenberg, formats and typesets them using a carefully designed and professional-grade style manual, fully proofreads and corrects them, and then builds them to create a new edition that takes advantage of state-of-the-art ereader and browser technology.”—https://standardebooks.org/