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HanziGraph
A webapp to visualize relationships among Chinese characters and to see example sentences that illustrate their use. Also available for Japanese learners.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I made a free, open-source tool for learning Chinese. You can check out a demo, or use it with simplified characters, traditional characters, or (less fully featured, but it's something) Cantonese.
Interesting, there's also decomposition data for individual characters (https://github.com/amake/cjk-decomp), I've been planning to use this to generate flashcards where you are presented with a "minimally contrastive pair" of characters, where the task is to differentiate between them (sound/meaning). This is something used in ML but also in real learning and is useful in order to learn to focus on and spot the small differences. Maybe that could be something you could incorporate?
Related posts
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Show HN: Learning Chinese and Japanese with graphs and trees
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Visualizing, and learning, the relationships among kanji, words, and morphemes
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Graph representations of Chinese and Japanese characters, words, and lemmas, for language learning (links in comments)
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Cantonese vocabulary visualization and example sentences
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Learning kanji through the words that connect them