By aggregating e-book records from various publishing institutions and digital libraries, it is possible to search for digital publications by topic, author, or title.
Digital Book Indexing Website
Click the "Visit Site" button on this page to open the official Digital Book Index website, then follow its on-screen instructions.
Digital Book Index is accessed online through your browser, so there is usually no local installation. Refer to its official site for details.
You can browse comparable reading sites under the e-books category on this site and pick the one that fits you.