The Online Books Page is almost 25 years old and continues to offer a valuable and ever-expanding index for finding books (and other materials, including speeches and periodicals) that are freely available online. In fact, as of this write-up, the index lists over 2 million books, including books made available by HathiTrust, Project Gutenberg, the Internet Archive, and a number of other sources....

At first glance, Open Book Publishers may look like an ordinary bookselling site. What makes the literary hub unique is that it not only publishes books in traditional print and ebook formats, but it also publishes "free online editions of every title in PDF, HTML and XML formats that can be read via our website, downloaded, reused or embedded anywhere." This online format also allows for more...