Anno collects a wide variety of Austrian newspapers and other periodicals.

A database of "over 3500 texts ranging from classic works of French literature to various kinds of non-fiction prose and technical writing from the 12th to the 20th century." Subscription required.

An extensive collection of Jewish newspapers and periodicals.

18th-century works on the history of the Middle Rhine

A large collection of primary sources, transcribed and translated.

Digitized images of the Göttingen Gutenberg Bible (ca. 1454), the Göttingen Model Book (ca. 1450), and Helmasperger's Notarial Instrument (1455).

Hanna Arendt Papers

Roughly 50 links to digitized primary documents. Collection is heavy on the modern era, with only a few links to pre-Revolution sources.

The German Federal Archives released large number of photographic images to the wikimedia Commons in 2009.

An impressive collection of primary sources covering all aspects of the medieval world. Focus is on Europe, with considerable coverage of Byzantium and Islam. One of the standard online sources for reliable primary material.

A guide to the Mysteries at Eleusis

Contains images of a variety of historically and culturally significant documents.

books from the collections of the Landesbibliothekszentrum Rheinland-Pfalz, the Stadtbibliothek Mainz, and the Universitätsbibliothek Trier

Robert Grosseteste (ca. 1170-1253) was an English theologian, philosopher, and bishop. "The Electronic Grosseteste is a freely accessible, web-based project that supports advanced research in the life and works of Robert Grosseteste specifically, and in medieval studies generally." The site contains electronic versions of Grosseteste's writings and a bibliography of works about him.