Articles and illustrations from the Encyclopaedia Britannica, 9th Edition (1875) and 10th Edition (1902). Searchable by keyword and browsable by subject index.
Provider of learning knowledge products through its online resources and distributed books and products.
Offers images, video and sound files from dozens of Smithsonian libraries, archives, and museums.
Allows people to visualize variety of content about specific topics and promotes active social engagement around these topics.
Rudiments of Wisdom Encyclopaedia
Thousands of cartoons by Tim Hunkin, offering simple information in many different categories including biology, music, psychology, music, language, religion and engineering.
Features a peer-reviewed open-access encyclopedia, containing knowledge that is curated by communities of experts.
Visual encyclopedia project that is a collaboration between Caltech and UCSD.
Offers a large assortment of topical wikis, as well as the traditional ability to edit them.
Free open-source multilingual encyclopedia with volunteer editors.
World Book, Inc.
Official site promoting its excellence in the production of award-winning encyclopedias, reference sources, and multimedia projects for the home and schools.