The European Library

The European Library is an Internet service that allows access to the resources of 48 European national libraries and an increasing number of research libraries. Searching is free and delivers metadata records as well as digital objects, mostly free of charge. The objects come from institutions located in countries which are members of the Council of Europe and range from catalogue records to full-text books, magazines, journals and audio recordings. Over 200 million records are searchable, including 24 million pages of full-text content and more than 7 million digital objects. Thirty five different languages are represented among the searchable objects.

More information, including a list of associated libraries, on the Wikipedia page

The website is.