[http://okular.kde.org/ Okular] is the KDE document viewer. While the underlying PDF reader library [[w:Poppler (software)|Poppler]] does not yet [http://live.gnome.org/Evince/Annotations support annotations], Okular stores inking information its own database. Okular is a part of KDE and as such available for Linux, Mac OS and Windows as part of the KDE suite (sometimes packaged with kdegraphics).