Kanji Connect 
A fun way to learn JLPT kanji/vocabulary!
Provides kanji meanings, readings and example vocabulary

Kanji Crush
Match 3 game  based on kanji form, radical, or onyomi.  Really get to know kanji forms and readings, and distinguish lookalike kanji!

PhraseBot
Use flashcard sets imported from Quizlet (any languages!), from single kanji up to full sentences.