The following are online resources that I have found useful in World History or in teaching medieval Europe. I am very grateful for additional suggestions.
Primary Source Texts
The following websites mainly contain out-of-copyright sources, which may contain archaic language. I focus here websites with large collections of sources.
Internet History Sourcebooks Project: The largest and best collection of primary sources (full text and excerpt) covering all of world history, though strongest in European history
Perseus Digital Library: Excellent site for all things classical, with high quality Latin, Greek, and English versions of fundamental texts
Internet Sacred Text Archive: A very large collection of sacred texts (loosely defined) covering regions ranging from Shinto to Baha'i to old Norse paganism (including sagas that have little to do with religion)
Christian Classics Ethereal Library: Translations of Christian thinkers including patristic, medieval, and modern authors
World Digital Library: A fantastic storehouse of visual sources from around the world, including old maps, illuminated books, and some film clips
Labyrinth: A general listing of medieval resources of various kinds, but not exclusively primary sources
Hildemar Project and the Plan of Saint Gall: Two focused websites, unlike those above... For those specifically interested in early medieval monasticism, here are two key sources presented online
A (Partial) Visitor's Guide to Carolingian France and Carolingian Germany: Another focused site, this time with visual sources... a tour of the visible remains of the Carolingian era
Internet History Sourcebooks Project: The largest and best collection of primary sources (full text and excerpt) covering all of world history, though strongest in European history
Perseus Digital Library: Excellent site for all things classical, with high quality Latin, Greek, and English versions of fundamental texts
Internet Sacred Text Archive: A very large collection of sacred texts (loosely defined) covering regions ranging from Shinto to Baha'i to old Norse paganism (including sagas that have little to do with religion)
Christian Classics Ethereal Library: Translations of Christian thinkers including patristic, medieval, and modern authors
World Digital Library: A fantastic storehouse of visual sources from around the world, including old maps, illuminated books, and some film clips
Labyrinth: A general listing of medieval resources of various kinds, but not exclusively primary sources
Hildemar Project and the Plan of Saint Gall: Two focused websites, unlike those above... For those specifically interested in early medieval monasticism, here are two key sources presented online
A (Partial) Visitor's Guide to Carolingian France and Carolingian Germany: Another focused site, this time with visual sources... a tour of the visible remains of the Carolingian era
Digital Models and Interactive Explorations
Wish you could travel to cool historical sites overseas? Bummed that many have been destroyed and apparently lost to view forever? Assuage your disappointment with these digital tours and other interactive sites. Note that some of these are still undergoing development and may not work with all browsers.
Lascaux Caves: Take a gander at Paleolithic cave art (note that this site is finicky about browsers and bandwidth)
Tomb-Chapel of Nebamun: Enter the tomb chapel of an ancient Egyptian aristocrat and see pictures of the good life that he hoped to take with him after death
Digital Hadrian's Villa Project: Walk around the luxurious palace grounds built by one of the great emperors of Rome
Virtual Chartres Cathedral: View the architecture, stained glass windows, and sculptures of one of the most beautiful achievements of medieval Europe (site is still partially under construction)
Medieval Women Interactive Exploration: While not a digital reconstruction in the same way, this site is a fun way of introducing yourself to an important area of medieval people's experience
Sacred Texts Turning the Pages: Eight of the most magnificent Christian, Jewish, and Muslim luxury manuscripts ever created—and you can leaf through selections of each book online; the British Library offers guidance on these texts and seventy of its other treasured sacred manuscripts (including ones from India and China) along with fascinating background information on connections between cultures and transformations over time
Lascaux Caves: Take a gander at Paleolithic cave art (note that this site is finicky about browsers and bandwidth)
Tomb-Chapel of Nebamun: Enter the tomb chapel of an ancient Egyptian aristocrat and see pictures of the good life that he hoped to take with him after death
Digital Hadrian's Villa Project: Walk around the luxurious palace grounds built by one of the great emperors of Rome
Virtual Chartres Cathedral: View the architecture, stained glass windows, and sculptures of one of the most beautiful achievements of medieval Europe (site is still partially under construction)
Medieval Women Interactive Exploration: While not a digital reconstruction in the same way, this site is a fun way of introducing yourself to an important area of medieval people's experience
Sacred Texts Turning the Pages: Eight of the most magnificent Christian, Jewish, and Muslim luxury manuscripts ever created—and you can leaf through selections of each book online; the British Library offers guidance on these texts and seventy of its other treasured sacred manuscripts (including ones from India and China) along with fascinating background information on connections between cultures and transformations over time
Videos
Education Portal: Free and detailed Western Civilization I video-textbook (with Western Civ II under development)
CrashCourse in World History: A more basic and limited video-textbook for World History I and II
PBS Documentaries: PBS has a number of good documentary episodes online (although the producers are often not skeptical enough about new theories)—see especially the Empires series, NOVA (PBS and Hulu), and Secrets of the Dead
Ancient Greek Hymns to the Sun, the Muses, and Nemesis performed by Orfeia Armonia, on reconstructed ancient instruments: A taste of the pleasant individual finds available on YouTube [I would be quite interested in hearing about other groups recreating ancient world music, so please contact me below if you know of any]
Viking Kittens: Just for fun...
CrashCourse in World History: A more basic and limited video-textbook for World History I and II
PBS Documentaries: PBS has a number of good documentary episodes online (although the producers are often not skeptical enough about new theories)—see especially the Empires series, NOVA (PBS and Hulu), and Secrets of the Dead
Ancient Greek Hymns to the Sun, the Muses, and Nemesis performed by Orfeia Armonia, on reconstructed ancient instruments: A taste of the pleasant individual finds available on YouTube [I would be quite interested in hearing about other groups recreating ancient world music, so please contact me below if you know of any]
Viking Kittens: Just for fun...