The Online Books Page is a searchable and browseable collection of over 25,000 free books on the Web, hosted by the University of Pennsylvania Library. The collection is available in various formats, that are all free for personal, noncommercial use.
The site is the brainchild of John Mark Ockerbloom, a digital library planner and researcher at UPenn. He is solely responsible for the content of the site.
Major parts of the site include: an index of thousands of online books freely readable on the Internet, pointers to significant directories and archives of online texts, special exhibits of particularly interesting classes of online books, and information on how readers can help support the growth of online books.