1. Google Books

google.com

2. Project Gutenberg

gutenberg.org
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3. Internet Archive

archive.org

4. Open Library

openlibrary.org

5. Smashwords

smashwords.com

6. Blurb

blurb.com

7. Scribd

scribd.com

8. Wattpad

wattpad.com

9. 24Symbols

24symbols.com

10. Books In My Phone

booksinmyphone.com