duolingo.com
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Duolingo is a popular gamified language-learning platform that offers a Japanese course with bite-sized lessons, covering vocabulary, phrases, and grammar, plus listening, speaking, and reading practice with spaced repetition.
More resources on Japanese (Intermediate)
Language Reactor
Browser extension for interactive subtitle learning on YouTube and Netflix, enabling vocabulary lookup and phrase analysis while watching.
Game Gengo
Technical deep dives into Japanese grammar and sentence structure utilizing native gaming contexts as immersive case studies. The channel breaks down vocab and grammar from games to help learners parse native speech faster.
YUYUの日本語 Podcast
High-level immersion content for intermediate learners, focusing on natural conversational flow and nuanced cultural topics. Episodes cover a broad range of themes from history to pop culture.
WaniKani
Kanji/vocab for intermediate levels
Maggie Sensei
Free JLPT N3/N2 grammar dictionary
Tofugu Japanese Guides
Free intermediate reading and grammar guides