Open Library is an open, editable library catalog, building towards a web page for every book ever published. Read, borrow, and discover more than 3M books for free.

You can search the standard bibliographic database of the Arabic Union Catalog and the content of the Arabic union digital library...

The Rijksmuseum and other participants in artlibraries.net sought a more advanced and future-looking system to give single-search access to the world’s most important art library catalogs. The Future of Art Bibliography group established the Art Discovery Group Catalogue on WorldCat because of its ability to pull results from participating libraries as well as other freely available databases faster than any other system.