The Web has many archives of public domain print books turned into eBooks. These are available in formats suitable to a variety of eReaders. Many titles are classics of fiction and nonfiction. Some are obscure, but interesting, items.  A few are newer, but have been released into the public domain for a variety of reasons. The following selected websites offer free eBooks in the most popular formats. Some have titles in a variety of languages, and some also offer audiobook downloads. So explore and enjoy!

All Romance

Baen Free Library

Feedbooks

Gizmo's Freeware

International Children's Digital Library

Internet Archive

ManyBooks.net

Project Gutenberg

Munseys

JustFreeBooks

Libertary

OpenLibrary
     

Other Sites

Smashwords                                                                                                              

Smashwords is an ebook publishing and distribution platform for ebook authors, publishers and readers. Offers multi-format, DRM-free ebooks, ready for immediate sampling and purchase, and readable on any e-reading device.

LibriVox                                                                                                                       

Volunteers read chapters of books in the public domain into digital audio (e.g. mp3), and then make the audio files available for free through the LibriVox catalog, a podcast, and other technologies.