Many of best Japanese reources are on other sites.
Here's a list of kanji listed by how frequently they appear in japanese newspapers.
Jisho is an amazing dictionary site.
Jim Breen's JMDict is the data that powers our dictionary and 'Make Cards' feature.
Nihongo Tango Speed Master Review
We love these books!
JLPT N4 Vocabulary
Memrise is the great-grandaddy of Japanese flashcard programs.
JLPT N4 Vocabulary Deck - With Audio and Example Sentences
Anki is the best flashcard system!