" JACAR is a digital database testifying to Japan's historical relations in Asia as well as elsewhere. This site provides access to official documents—dating from the Meiji era through 1945—of the Japanese Cabinet, the Ministry of Foreign Affairs, as well as the Army and Navy. In an effort to share history as it has been documented, JACAR's archives showcase the original records, including full images of the documents, all in digitized form, on an unprecedented scale." -JACAR website
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Provides access to many databases, including: Komonjo Full-Text Database, Dai Nihon Shiryo Unified Database, Databases of images, as well as useful tools like Database of Kuzushi-ji, Online Glossary of Japanese Historical Terms.