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xournalpp
Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.
Sign: => If you mean add what looks like a graphical signature, then xournalpp, but if you mean a "digital signature", that's something that is still not well supported on Linux; okular can do it, but getting the necessary certificate is a pain.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Page organization => If you want a gui, you could use pdfshuffler or pdfsam, though I usually use command like tools like qpdf (or pdftk, stapler, pdfjam, or even ghostscript).
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Page organization => If you want a gui, you could use pdfshuffler or pdfsam, though I usually use command like tools like qpdf (or pdftk, stapler, pdfjam, or even ghostscript).
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Export to PNG, JPEG, Word, Excel => For the first two you could use gimp, though I usually use pdftoppm and/or imagemagick convert from the command line. I try not to convert to Word; that's going against the grain, but the few times I've had, I've use calibre's ebook-convert. I gather LibreOffice has gotten much better at importing PDFs in recent years as well.
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Any encrypted note taking app that accepts IMAGES embedded in the body of the notes?
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Programma per leggere e modificare i pdf (Windows)