hanabira.org/japanese/conjugation-practice
Interactive verb conjugation trainer with adaptive drills covering godan, ichidan, and irregular verbs, plus JLPT-specific content including honorific and sound-changing verbs.
GrammarApps and toolsJLPT and other testsVerb conjugationTe-formJLPTFuriganaFreeTyping and inputKeigo and politenessPassive and causativeQuizzesJLPT N3JLPT N5