Wanikani has been a great way to study the kanji. What is also great about it, is the open data framework that it employs, enabling anyone who joins to get access to a huge data set of kanji, readings, meanings, mnenomics, levels in WK, JLPT, JOYO, etc. This data can be used for all kinds of purposes – I have used it as input for various projects including:

• A mini kanji dictionary, with kanji sorted by the main onyomi.
• A set of writing practice sheets. Actually multiple sets, with different sized practice boxes, organized by WaniKani level and JLPT level.
• Vocbulary study sheets, organized by WaniKani Level.