- Libraries411.com - Searchable directory and maps for over 20,000 US and Canadian public libraries.
- Libweb - Searchable and categorized links to over 7,000 pages from libraries in over 100 countries, including academic, public and national libraries worldwide; library organizations and consortia; and related sites.
- List of Judaica Library Websites - Alphabetically sorted links to Jewish library websites.
- Lib Web Cats - Searchable database of over 5,000 library sites worldwide. Listings include mailing addresses and links to online catalogs.
- Library and Related Resources - List of references indexed by topics like public, school and national libraries. Also includes sections about organisations and science resources.
- ISBNDB - Multilingual database of international standard book numbers. Offers the possibility to investigate by category.
- Canadian Directory of Special Collections - Directory for these types of libraries in Canada. Contains the description and history of each collection.
- National Library Catalogues Worldwide - Index of libraries with detailed descriptions about the handling of the search interfaces sorted by countries.
- The WWW Library Directory - Searchable directory of over 8,000 library and library-related sites worldwide arranged by countries. Includes a US section sorted by states.
- NLS/BPH: Reference Directories Index Page - A list of directories provided by the U.S. Library of Congress, National Library Service for the Blind and Physically Handicapped.
- LibDex - World index of library sites with over 18,000 database entries. Includes a list of libraries by catalog vendor.
- Library and Information Science - IFLA list of world wide web accessible libraries worldwide sorted by countries.
- US State Library Links - List of US libraries sorted alphabetically and by state.
- Global Reach - Searchable database which shows the involvement of librarians and libraries in international library activities.
- Philadelphia Area Consortium of Special Collections Libraries - Includes links to member libraries, online exhibits, and catalogs.
- Internet Quick Reference Shelf: Library Resources - Collection of links presented by the University of Indiana categorized by topics.
- Libraries of the World and their Catalogues - Links to national, academic and public libraries and their catalogues. Compiled by Sylvia Milne, a retired librarian.
- Law Libraries Worldwide - Chan Robles and Associates provides links to major law libraries around the world.
- Switzerland's Directory of Archives and Databases - Information on contents, location, contact, online catalogues, and the conditions of use of hundreds of databases, archives and libraries in Switzerland.
- Bookwire - Descriptive listing of US libraries alphabetically and by state, as well as an index of Asian, European, Canadian and special libraries.
- Bishop Library Index - Links to worldwide libraries, mostly with descriptions of the specific websites by Kenneth Bishop.