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I am very happy with Xournal++ (which can also be used to add text to the pdf in order to fill a form for example).

Just wanted to add: Xournal (not ++) can also add text and add pictures (like a pic of a signature) too.

Xournal can be installed from the official Debian repository, but not Xournal++ (not yet - it's apparently being worked on).

So Xournal is very convenient for filling in basic forms on Debian and is easier to install.

Xournal++ could be installed on Debian by downloading a .deb, or using snap or flatpak. But not as convenient as installing Xournal via apt-get.

When Xournal++ makes its way into the official Debian repository, I might switch to it.

For now, I'm very happy with Xournal (the original)!