xournal
Lightweight notetaking and sketching app.
What is xournal?
Xournal is an application for notetaking, sketching, keeping a journal using a stylus. It is free software (GNU GPL) and runs on Linux (recent distributions), Windows and other GTK+/Gnome platforms.
It supports drawing and writing on pdf's.
Discontinued
It hasn't been updated since 2017, but there is an active fork 
Xournal++
xournal Screenshots
xournal Features
xournal information
Supported Languages
- English
Comments and Reviews
Tags
- Journaling
- Note-taking
Recent user activities on xournal
Paul added xournal as alternative(s) to Penly
LukeFeather added xournal as alternative(s) to Papyrus.day
Nikola Jovanovic added xournal as alternative(s) to Bookworm (by Blind Pandas Team)
You can annotate PDF as if you were using a paper, without special textboxes as in other PDF editors. In addition, Xournal saves your annotations in a separate XOJ file, which is really small compared with the original PDF. Having a separated file for annotations, I can share the PDF without sharing them, and I don’t need to duplicate the PDF, saving space. Downsides are an outdated interface, and a rare way of using tools.
Ocular app is very good but I got surprised about Xournal , even better ... Can export PDF notes to PDF . http://www.linuxinsider.com/story/74882.html
First app that was usable to actually edit and annotate PDFs. Graphics capabilities sometimes are fiddly though.
Easy way to make small additions to PDFs
Great app for PDF annotation. It will make the text remain selectable and copyable.