Rnote is an excellent app for sketching and taking handwritten notes. Check it out here.

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Rnote is an impressive open-source app written in Rust and GTK 4. It provides an adaptive UI focused on stylus input. The developers note that the native file format used by Rnote may not be stable enough for compatibility between newer versions of the application.

Rnote: An Open-Source Drawing App for Notes and Annotation

Rnote: Vector-based Drawing App for Sketching and Handwritten Notes