Open Library is an open, editable library catalog with an attractive facade and a lofty mission. The mission? To build an online catalog with a web page for every book ever published. The best part? You can help. From the homepage, click Sign Up, then create a free Open Library account in two simple steps. From there, add new books, write descriptions, manage lists, and generally enjoy contributing to one of the most exciting library projects on the web. Of course, you don’t need an account to browse the site, with its 20 million records (and counting). Simply click Authors, Subjects, Recently, or Lists to search the site by category, or type a keyword into the general search function.