Denshi Jisho: Online Japanese Dictionary

Kotobank : search from 99 dictionaries and encyclopedia at once.

Jim Breen's Online Japanese Dictionary Service

Digital Dictionary of Buddhism 電子佛教辭典 ID

Edited by Charles Muller, the dictionary provides English definitions for Buddhist terms in a range of languages, including Chinese, Japanese, Korean, Pali, Sanskrit, and Tibetan, as well as pronunciations. It includes A Dictionary of Chinese Buddhist Terms : with Sanskrit and English equivalents and a Sanskrit-Pali index, compiled by William Edward Soothill and Lewis Hodous. 

 Japanese Garden Dictionary

JAANUS: Online dictionary of Japanese Architecture and Art Historical Teminology Compiled by Dr. Mary Neighbour Parent

denki-etcetra Biographical data for 173 late-Edo intellectuals, created by Anna Beerns.

Wikipedia

The Lunar Calendar in Japan　

By Steve Renshaw and Saori Ihara

JapanKnowledge + NR ID   All searches enter from here.

Some 20 reference books below are searchable at once, or individually.

Encyclopedia of Japan is a handy and reliable tool in English.

日本大百科全書（ニッポニカ) this encyclopedia search provides relevant web links as well.

JapanKnowledge instruction videos in Youtube