Tokyo University Shiryō hensanjo  http://wwwap.hi.u-tokyo.ac.jp/ships/db-e.html
Includes many databases on premodern Japan for historical terms, photographs and documentary sources.

Nara: Nabunken  http://www.nabunken.go.jp/
Includes: Archaeologically Excavated Japanese Gardens Database, a Chronology of Asuka & Nara Periods, images of The Asuka & Fujiwara Capitals and of the Heijō palace.

Heian Genji monogatari kakō bunka detabesu   http://homepage3.nifty.com/genji_db/
Compiled by a Japanese scholar, Tateishi Kazuhiro; includes images and an extensive bibliography of reworkings of the Genji tale including 20 different comic book adaptations, along with listings of plays, movies, tv dramas, books.

Scrolls of the Heiji disturbance   http://learn.bowdoin.edu/heijiscroll/
The thirteenth century scrolls of the Heiji disturbance (1159) provide a rare and valuable depiction of Japanese armor as it was worn during the early Kamakura era (1185-1333).

Scrolls of the Mongol Invasions of Japan  http://www.bowdoin.edu/mongol-scrolls/
This site features Takezaki Suenaga's Scrolls of the Mongol Invasions of Japan (Moko Shurai ekotoba). The original scrolls were written during Suenaga's lifetime in the 13th century, but lost for centuries. They reappeared in the 18th century and were copied repeatedly, before being pasted into two scrolls in 1823. This website presents the original scrolls, along with the 18th & 19th-century copies and a 21st-century reconstruction, using technology that allows users to view the scrolls as they were originally intended. Other features: side-by-side comparison of different versions of the scrolls; a guided view with commentary by Professor Tom Conlan of Bowdoin College; and a glossary of terminology.