Lib Web Cats
Searchable database of over 5,000 library sites worldwide. Listings include mailing addresses and links to online catalogs.
http://www.librarytechnology.org/libwebcats/

ISBNDB
Multilingual database of international standard book numbers. Offers the possibility to investigate by category.
http://isbndb.com/

Library and Related Resources
List of references indexed by topics like public, school and national libraries. Also includes sections about organisations and science resources.
http://www.ex.ac.uk/library/wwwlibs.html

National Library Catalogues Worldwide
Index of libraries with detailed descriptions about the handling of the search interfaces sorted by countries.
http://www.library.uq.edu.au/ssah/jeast/

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.
http://www.loc.gov/nls/reference/directories/

Library and Information Science
IFLA list of world wide web accessible libraries worldwide sorted by countries.
http://www.ifla.org/II/natlibs.htm

Global Reach
Searchable database which shows the involvement of librarians and libraries in international library activities.
https://cs.ala.org/global/

Internet Quick Reference Shelf: Library Resources
Collection of links presented by the University of Indiana categorized by topics.
http://www.indiana.edu/~librcsd/internet/Library_Resources/

Law Libraries Worldwide
Chan Robles and Associates provides links to major law libraries around the world.
http://www.chanrobles.com/lawlib1.htm

Libraries and Archives
Index of links to universities and libraries worldwide as well as references to various directories.
http://www.uky.edu/Subject/libraries.html

Bookwire
Descriptive listing of US libraries alphabetically and by state, as well as an index of Asian, European, Canadian and special libraries.
http://www.bookwire.com/bookwire/libraries/libraries.html

List of Judaica Library Websites
Alphabetically sorted links to Jewish library websites.
http://www.angelfire.com/on2/smbergson/jlibraries.htm

US State Library Links
List of US libraries sorted alphabetically and by state.
http://www.angelfire.com/ks/windshipgenhelp/statelib.html

Bishop Library Index
Links to worldwide libraries, mostly with descriptions of the specific websites by Kenneth Bishop.
http://members.lycos.co.uk/kbishoplib/

Libraries & Archives
List of references structured by topics as internet and science libraries.
http://book-smith.tripod.com/bml-libraries.html

Lii.org: Librarianship
Point of access for librarian-selected internet resources worldwide asorted by topics.
http://lii.org/search/file/libraries

Canadian Directory of Special Collections
Directory for these types of libraries in Canada. Contains the description and history of each collection.
http://www.collectionscanada.ca/collectionsp/index-e.html

Philadelphia Area Consortium of Special Collections Libraries
Includes links to member libraries, online exhibits, and catalogs.
http://www.pacscl.org/

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.
http://lists.webjunction.org/libweb/

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.
http://www.swissinfo.org/sen/swissinfo.html?siteSect=821&cat=20

Libraries411.com
Searchable directory and maps for over 20,000 US and Canadian public libraries.
http://www.libraries411.com

Libraries of the World and their Catalogues
Links to national, academic and public libraries and their catalogues. Compiled by Sylvia Milne, a retired librarian.
http://www.sylviamilne.co.uk/libcats.htm

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.
http://travelinlibrarian.info/libdir/