Network Graph Visualization Software

Just a short list of network/graph visualization software we have used for various things. I keep losing track of them, so I figured it was worth writing them down.

• GraphViz is maybe the most venerable.
• NetworkX is a pretty cool toolkit for Python. Very easy to use, a great starting point.
• D3's Network Graph can do some nice things, well integrated into web pages.
• Graphs and Networks in Mathematica. I have used a couple of different approaches in Mathematica, including just treating the graph as a variable. I should dig out examples; I wasn't fully happy with what I managed with simple code. But if you're willing to go through the syntactic pain, you can do amazing things in Mathematica.
• OmNeT++ and ns-3 are full-on (classical) network simulators we have used for some sims, and they have built-in or add-on visualization tools.

Do you have a favorite or a dislike among this list? What have I missed?