UWILINC Provides access to numerous e-books both subscribed and free.
Freely Available Ebooks
Digital Book Index - Provides lines to more than 165,000 full-text online books, most of which are free
The Free Library - Provides free, full-text versions of classic literary works. Also included is a collection of periodicals from hundreds of leading publications.
Google Books - Google is working with libraries and publishers to digitize and index many books so they are searchable. Access to many are in full-text.
Hathi Trust Digital Library is a partnership of major research institutions and libraries working to ensure that the cultural record is preserved and accessible long into the future.
Internet Archives is a non-profit digital library offering free universal access to books, movies & music, as well as 150 billion archived web pages
The Online Books Page - The most comprehensive listing of publicly-accessible online e-books.
The Open Library Open Library is an open, editable library catalog, building towards a web page for every book ever published.
Project Gotenberg - It is the oldest digital library. The items in its collection are the full-texts of books that are out of copyright restrictions.