Libraries of the World and Their Catalogues
- Links to national, academic and public libraries and their catalogues.
- http://www.sylviamilne.co.uk/libcats.htm

Libdex
- A worldwide directory of library homepages, web-based OPACs, Friends of the Library pages, and library e-commerce affiliate links.
- http://www.libdex.com/

lib-web-cats
- Searchable database of over 4,500 library web sites and online catalogs worldwide.
- http://www.librarytechnology.org/libwebcats/

Hytelnet on the World Wide Web
- A listing of library catalogs from the Americas, Europe, Middle East, Asia, Pacific, and South Africa, plus other library resources.
- http://www.lights.com/hytelnet/