Features:
* Zooming
* Threaded loading of several graphs in tabs
* Saving of the recent files list
* Manual reload of files
* Display of a bird-eye view of the graph
* Moving of the graph by dragging
* Full featured printing
* Perfect drawing of all graphviz example graphs
* Automatically choose dot for directed graphs and neato for undirected
* Possibility to use an arbitrary layout algorithm as soon as it produces xdot format
* Automatic reloading with user confirmation of (externally) modified files (configurable)
* Open new instances as new tabs in the old one (configurable)