There are plenty of search engines on the web for ebooks. Neotake is a search engine for ebooks that offers a couple of extras. Neotake provides the option to become a member (free registration) of a community that ranks and reviews ebooks. Registered members can also network with other readers.
To make searching for ebooks a little bit easier, Neotake offers a browser plugin for Firefox, Chrome, and Internet Explorer. The browser plugin allows users to search for ebooks without having to open Neotake in a separate browser window.
If you’re in need of some new reading materials for your classes, but you don’t have money to spend on new books, search for some free ebooks on Neotake.