Annotation/Mark up

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) and other GTK+/Gnome platforms. It is similar to Microsoft Windows Journal or to other alternatives such as Jarnal, Gournal, and NoteLab. Note: is open source and allows some annotation, but its PDF reading ability is very limited. It also uses its own format to store annotations