Update: If you are a Python user, check out Netwulf!
Web app for styling networks with buttons and sliders, powered by d3-force.
You need to visualize a network and show it to people. The easy solution is to use networkx, which at best looks like a nightmare. Instead you go through the trouble of throwing your data into your favorite d3 boilerplate example, play with the simulation parameters and screenshot the network when it looks nice. The difference is remarkable:
Your audience will applaud your design skills and ask you how you make your figures over drinks that they payed for.