Qanava is an open source LGPL’ed C++ library designed to display graphs in a Qt graphics view. Qanava provide classes to generate various layouts of directed graphs and visualize their nodes with custom styles on a graphic canvas.
Qanava is primarily developped with Visual C++ 2011 and Qt 5.3 but should compile well with GCC on Linux. Qanava depends on Qt property browser: https://qt.gitorious.org/qt-solutions/qt-solutions
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Qanava also include a simple graphics widget container for QGraphicsView with a standalone windowing system (qan::ContainerGraphicsItem could be used without a full Qanava dependency):