From Learning Japanese Wiki (RtKWiki)
- Tae Kim's Japanese Grammar Guide For those who want to learn Japanese grammar in a rational, intuitive way that makes sense in Japanese.
- IMABI Grammar discussions suitable for all levels taught in lessons which have undergone years of editing with lots of native and Japanese educator support.
- JGram Japanese Grammar database and community, with JLPT quizzes.
- Niwasaburoo's Outline of Modern Japanese Grammar Descriptions of Japanese grammar in Japanese