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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 simple one myself as a one file html app. https://gitlab.com/aksrikanth/flash-cards
I can relate to this. I had fond memory of SuperMemo on DOS and wrote a little terminal tool “lrn” inspired by it: https://github.com/krychu/lrn
I acknowledge it’s simple, runs on terminal only and lacks bells and whistles. But this is also probably why I use it so much.
I'm also building an Anki clone (sigh) that I'm calling "Github for flashcards".
>A free, open source, local-first, spaced repetition system that works offline, has p2p syncing, plugins, and first class support for collaboration.
https://github.com/AlexErrant/Pentive
Very much a WIP, completely unusable, but I recently made a video demoing the technical proof of concept.