Xournal is a GTK+/Gnome application for notetaking, sketching, keeping a journal using a stylus on Tablet PCs and other platforms. It aims to provide superior graphical quality (subpixel resolution) and overall functionality.
Seemed to work great on the surface, but there's a major horrible flaw. I spent many hours modifying a PDF file, but Xournal has it's own internal format which is of course unreadable by anything else. I forgot to save it as a PDF, and when I reopened the Xournal file, the entire PDF background was gone (it only saved my typing, the original PDF graphic form was gone). End result, I have to redo all of my work - in some other application I have not decided on yet. After it was too late, I noticed there were patches that have never been applied - sitting there since 2012. I do not think any of them applied to this bug. The worst thing about it, there does not seem to be anywhere to get support. I dare say this is a dead project.