Resources for Japanese

There is a very good list at JAIST: Catalogue of Language Resources and Tools in Japan

Corpora

Proprietary

• Japanese plain text and Co-occurrences at LCC (downloadable and web-searchable, but only for non-commercial use)
• Balanced Corpus of Contemporary Written Japanese (BCCWJ) (subset is web searchable at Kotonoha)
• HamleDT, harmonized dependency treebanks of many languages, common annotation style.

Free/Open Licence

Multilingual

• Tanaka Corpus by Tanaka Yasuhito, edited by Jim Breen, under a CC-BY-SA 3.0 licence
  • Tatoeba Updated version of the Tanaka Corpus; ≈150,000 sentence pairs (CC-BY)
• Japanese-English Bilingual Corpus of Wikipedia's Kyoto Articles ≈500,000 pairs of manually-translated sentences (CC-BY 3.0)
• National Diet Library Subject Headers Japanese Subject Headers, with paraphrases including English Translations (non-commercial attribution)
• English-Japanese Translation Alignment Data aligned by Masao Utiyama (GFDL, CC-by-nc 1.0)
• WordNet Definitions and Glosses ≈180,000 sentence/phrase pairs from the Japanese Wordnet (WordNet license, similar to BSD)
• Japanese Translation of SemCor ≈14,000 sentences from the Japanese Wordnet, easily aligned to the English source (WordNet license, similar to BSD)
• The Kyoto Free Translation Task (KFTT) by Graham Neubig, 1,235 sentences of Japanese-English manually word-aligned
• JEC Basic Sentence Data by Kyoto University: 5,304 basic Japanese sentences based on Kyoto University Case Frame Data, translated in Chinese and English

Monolingual

• Kyoto University and NTT Blog Corpus
• Compilation of 64,776 potential Japanese compound verbs

Grammars

Free/Open Licence

• Jacy HPSG grammar MIT Licence

Unknown licence

• KPML generation grammar (downloadable)

Dictionaries

Free/Open Licence

• JMdict/EDICT Japanese-English and Japanese-Multilanguage dictionary in text and XML formats, by EDRDG (Electronic Dictionary R&D Group) - 170,000 entries, (CC-BY-SA 3.0 licence)
• ENAMDICT/JMnedict proper name dictionary in text and XML formats - 740,000 entries, by EDRDG (Electronic Dictionary R&D Group), (CC-BY-SA 3.0 licence)
• Japanese version of WordNet by NICT, (WordNet license, like BSD)
• Kanjidic/Kanjidic2 Kanji dictionaries in text and XML formats covering about 13,000 characters, by EDRDG (Electronic Dictionary R&D Group), (CC-BY-SA 3.0 licence)

Unknown licence

• List of Japanese transitive/intransitive verb pairs (dead link?)