There are a good number of electronic books, popularly known as e-books which are available on the Internet free of cost. They are available in most of the subject areas. Some are available for browsing and many titles are for downloading. Please go through the following links for more information.
World e-book Library is a global coordinated effort to preserve and disseminate classic works of literature, serials, bibliographies, dictionaries, encyclopaedias, and other reference works in a number of languages and countries around the world. Provides free access to collection listed under 'Public'.