Portal

http://www.infocobuild.com/language/japanese/japanese.html

This provides a comprehensive collection of online resources for learning Japanese, including online Japanese-English dictionaries, JLPT exam, grammar lessons, Kanji, vocabulary, useful expressions, listening practice, and video lessons. All the resources contained here have good content and are available for free. You can use them as a supplemental reading or self-teaching material for your Japanese study.