Xournal++
Handwriting note-taking and PDF annotation with pressure-sensitive stylus support.
Why it is included
GPL-2.0+ Linux tablet favorite also available on Windows/macOS.
Best for
Annotated lecture PDFs and digital whiteboards with export to PDF.
If you use Windows, Mac, or paid tools
Notes/PDF markup alternative to GoodNotes (paid), Notability (paid), and OneNote with a stylus.
Strengths
- Pressure curves
- Layers
- LaTeX math input
Limitations
- Not a collaborative real-time whiteboard out of the box
Good alternatives
Rnote · Okular annotations
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