: Optimized for intuitive touch screen access and freehand writing. Notebook Pro
: An open-source (GPL) productivity tool excellent for PDF annotation and sketching.
: Features an auto-scrolling page that allows for uninterrupted writing. PDF Annotation : You can import, mark up, and re-export PDF documents. Paper Styles
: A free alternative that offers comprehensive note-taking capabilities. Troubleshooting Official Versions
