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Xournal++

Honorable mention

Handwriting note-taking and PDF annotation with pressure-sensitive stylus support.

notespdfstylus

Graphics & Design

Ipe

Honorable mention

Extensible drawing editor for creating figures in PDF/EPS/SVG with LaTeX labels and geometric constraints.

vectorpdflatexacademicdiagram

Office & Productivity

Sumatra PDF

Honorable mention

Minimal Windows PDF, eBook, and comic viewer focused on speed and a small install size.

pdfviewerwindows