  We introduce a new free, open-source compound graph editing and layout
framework named Chisio, based on the Eclipse Graph Editing Framework (GEF) and
written in Java. Chisio can be used as a finished graph editor with its
easy-to-use graphical interface. The framework has an architecture suitable for
easy customization of the tool for end-user's specific needs as well. Chisio
comes with a variety of graph layout algorithms, most supporting compound
structures and non-uniform node dimensions. Furthermore, new algorithms are
straightforward to add, making Chisio an ideal test environment for layout
algorithm developers.
