This database (formerly called the History E-book Project) includes the complete contents of 2,800 high-quality humanities books from nearly 100 publishers and a working group of learned societies. About 500 works are to be added each year.

Eclectic collection of over one hundred texts in reference, classic literature, and verse. Includes the entire 50-volume Harvard classics set.

Searchable index to peer-reviewed monographs and edited volumes published under an open-access business model. Currently in beta (August 2012), the site offers titles in a variety of subjects from academic publishers including Brill, Open Book Publishers, Palgrave Macmillan, and the University of Michigan Press.

EEBO provides digital access to over 125,000+ literary and historical classics. All works are in full image format, meaning that images accurately reflect the way the works appeared in their original printed editions. Besides literary and historical works, the database also includes musical exercises, prayer books, pamphlets, proclamations, almanacs, calendars, and many other primary resources.
Funding was made possible by a gift from William Buice, Class of 1961.

Eighteenth Century Collections Online (ECCO) provides access to the digital images of every page of 150,000 books published during the 18th Century. With full-text searching of approximately 33 million pages, ECCO allows researchers new methods of access to publications in the fields of history, literature, religion, law, fine arts, science and more.

Access to thousands of online books -- some available in full, some only display selected pages or only citations and snippets of text, depending on copyright status. Book content is provided by publishers or scanned from large library collections.

A project intended to support and enhance scholarly writing by publishing a small handful (5 or 6 each year) of prize-winning dissertations as state-of-the-art electronic books. "While these digital monographs can be printed out and read in the traditional way, the electronic versions offer elements that cannot be conveyed in print: extensive documentation, hyperlinks to supplementary literature, images, music, video, and links..."
You can see the titles in W&L's collection by viewing the list in Annie.
Please note that this is not the same resource as Project Gutenberg.

Repository provide "long-term preservation and access services for public domain and in-copyright content from a variety of sources, including Google, the Internet Archive, Microsoft, and in-house partner institution initiatives." As of November 2010, the database contains over 7 million volumes, nearly 2 million of which are in the public domain.

Contains nearly 1.5 million texts (books, etc.), many freely-available for sharing on the Web.

OAIster (Open Archives Initiative) "harvests" collections of digital resources from nearly 300 academic and research-related institutions, now totaling over 23 million items.
It focuses on materials (reports, studies, other documents) created at respected academic and research institutions.

Texts of over 20,000 books.

Compilation of over 200 reference books (encyclopedias, dictionaries, more),containing millions of entries, published by Oxford University Press. You can search an entire category ("History") or one book at a time.

Texts of over 10,000 books, mostly older literary works in the public domain in the U.S.

Safari® Tech Books Online provides reference sources from many of the leading technology publishers, including: Adobe, Microsoft, O'Reilly, QUE, Sams, and more. Featuring over 9,800 titles, it covers the technologies most essential to users including certification, enterprise computing, graphics, Java, Web development, Windows, XML, Linus/Unix, and more.

The Ultimate Accountants' Reference Including GAAP, IRS & SEC Regulations, Leases, and More, Second Edition covers accounting regulations for all aspects of the financial statements, accounting management reports, and management of the accounting department including best practices, control systems, and the fast close. It also addresses financing options, pension plans, risk management, mergers and acquisitions, options, and taxation topics.