This site is managed by the Japan Foundation. The test may be taken for free.
http://momo.jpf.go.jp/sushi/
You can study Hiragana, Katakana, Kanji and grammar.
http://www.isc.toyama-u.ac.jp/%7Eraicho/index.html
You can study Hiragana, Katakana and easy daily conversation.
http://home.hiroshima-u.ac.jp/~funjapa/FS2/step_index.htm
日本語を勉強している学習者向けに参考書を紹介している。
http://www.bonjinsha.com
It offers information about scholarship, support programs for international students, education fairs and Examination for Japanese University Admission for International Students(EJU).
http://www.jasso.go.jp/
This homepage provides useful information in English and other languages for foreigners to live in Japan.
http://www.clair.or.jp/tagengo/
Explore Japan with this site from various aspects.
http://web-japan.org/kidsweb/