Skyrails is a Social Network and Graph Visualization System with a built-in programming language. The system is not solely aimed at expert users, since through other scripting languages, menus can be built and the system used by a wider audience. Also, as Yose Widjaja affirms, the language is pretty easy to learn. However, because the software is currently on beta mode, there is not much documentation for the language and hence self-learning and guessing is the only way to go for now. Yose says this will change in the future.
There's a flickr page with different screenshots of the application and a striking video demo of the tool on YouTube, which shows the Scotland Corporate Interlocks in early 1900.