Free online biodiversity encyclopedia, with hundreds of thousands of new images and specimen data as to build a web page for each of the 1.9 million recognized species.
The History Commons contains summaries of events, which are published on the website in the format of dynamic timelines. These timelines can be filtered by investigative project, topic, or entity (e.g., a person, organization, or corporation).
Wikibooks is dedicated to developing and disseminating free, open content textbooks and other classroom texts. We currently host 5666 textbook modules, in various stages of development, from those needing a lot of work to those that are nearly perfect.