Resource Discovery Network RDN is a free Internet service dedicated to providing effective access to high quality Internet resources for the learning, teaching and research community. This collection is searchable by subject discipline and includes sites that range from courses delivered entirely via the web to courses that offer specific activities related to a class assignment or perhaps courses that offer class support materials via the web. World Lecture Hall contains links to pages created by faculty worldwide who are using the Web to deliver class materials. Subjects are listed alphabetically and a search facility is available . This is a gateway to resources on the web run by a loose confederation of volunteers, who provide key links for particular areas of which they are expert.
Information is catalogued by subject area and a keyword search facility is available.
The site is mirrored at various locations. You might also find a search of appropriate links in the Organisations, Networks and Datasets profitable.