The Internet History Sourcebooks Project is a collection of public domain and copy-permitted historical texts presented cleanly (without advertising or excessive layout) for educational use. Hosted by Fordham University this site contains extensive links to source documents and websites for all periods in World History. Selected subsites include:
Since this project has been going on since the late 1990's some of the links have become defunct, but by and large this is a very useful site for the study of history.