Refer to the project's README file for more details.
GRADE Jouyou kanji by kyouiku grades + Kanji Kentei levels
ICE Ice's Hanzigong-style kanji grouping
WANI WaniKani
RTK Remembering the Kanji (Book 1, 6th ed.)
KKLC The Kodansha Kanji Learner's Course
Odyssey 2001.Kanji.Odyssey