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novelWriter
novelWriter is an open source plain text editor designed for writing novels. It supports a minimal markdown-like syntax for formatting text. It is written with Python 3 (3.8+) and Qt 5 (5.15) for cross-platform support.
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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.
Alternatively, if you want Scrivener-like and are happy with open source projects, novelWriter scratches some of the same itch and is (a) free and (b) available on Linux, Windows, and macOS: it has a similar project-oriented interface to Scrivener, can export projects in HTML, Open Document, Markdown, Plain Text, or PDF, supports tagging and metadata, and uses Markdown for authoring. It's much less hot on importing foreign files (it's really an authoring tool) but is implemented in Python, uses XML/Json for internal files/metadata/configuration, and in use feels like an early version of Scrivener 1.x (which is really what your students want, but Lit'n'Latte discontinued it about a decade ago and you can no longer buy it).
On another Reddit sub, someone mentioned Trilium.