Below you will find good sources of free and safe downloadable electronic books, videos, audio and other items that are available for free on the Internet. Many book and media sources published prior to 1923 are available in some type of free format that can be downloaded free of charge.
Google books advanced search allows you to find a wide selection of books including those downloadable in epub or .pdf formats
The Internet Archive
The Internet Archive contains public domain works in a wide variety of formats
Axis 360 e-book collection
A collection of e-book titles in various academic disciplines
A large collection of full-text searchable online books on the internet.
A large collection of public free public domain items in audio, video and print.
A collection of e-book fiction and non-fiction titles for children, young adults and adults.