This interactive wiki-style online textbook of world history is a collaborative work of students from Ohio middle schools. There are sections on prehistory and human migration, ancient history, the Middle Ages, Renaissance and Reformation, Golden Age of West Africa, scientific revolution, exploration, and economics. It is multimedia, with student drawings, illustrations, photos, and videos.
A second wiki, ChardonWorldHistoryTextbook, covers many of the same areas with a different approach. It also includes sections on the Americas, and modern history and wars.