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pandocs
The infamous Pan Docs historical document: the single, most comprehensive Game Boy technical reference. (by ISSOtm)
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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.
At any rate, if anyone sees any information they feel is incomplete or missing from GBdev's version of Pan Docs, I'd encourage them to contribute on GitHub.
There’s this excellent overhaul of the FIFO info: https://github.com/ISSOtm/pandocs/blob/rendering-internals/src/Rendering_Internals.md hasn’t been merged for a year for some reason
And an open source sdk at https://github.com/DragonMinded/libdragon libdragon is well on its way to surpassing Nintendo's libultra, but the discord has people knowledgeable about both.