I recommend the following free web sites to help you study Japanese:
Denshi Jisho An online Japanese dictionary
Memorising the Hiragana and Katakana Learn the Japanese phonetic alphabets
JapaneseUp Japanese learning games and tools
Kanji alive A free study tool for reading and writing kanji
The Furiganizer Adds kana to Japanese text to aid kanji comprehension
JLPT Resources A huge collection of JLPT preparation material
Memrise Online study site with many excellent Japanese courses
LTool.net An excellent collection of Japanese study tools
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