Generate pretty image of tree/graph

I want to generate a pretty image of my tree/graph data. I had a look at Graphviz, but the renderings are not great. Do you kno开发者_如何学Cw of a solution that will produce pretty images and run on Linux?

NetworkX is an amazing network graph library, in which you can generate images of graphs and trees.

I would take another look at Graphviz, from my limited experience, the output by default is not all that pretty, but, with a little work, you can style it to look much better.

Another option is Gephi--I've never used it, but it does run on Linux.