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AppFlowy
AppFlowy is an open-source alternative to Notion. You are in charge of your data and customizations. Built with Flutter and Rust.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
also take a look at AppFlowy - a note taking app. i believe they use Flutter (Dart) for the GUI part, but the logic is written in Rust.
that said, it's not impossible. if i had to do it, i would probably pick a framework that renders to HTML+CSS (e.g. Dioxus), as the text layout for those is quite mature. but the "editing" part will still not be easy.
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