Graphviz Javascript Library Interactive Demo
Graphviz (link) is a utility which allows you to generate nicely arranged visual graph relationships through simple text input written in DOT code (think markdown).
It turns out that the utility was converted to a javascript LLVM bytecode and exposed as a library.
I put together an interactive page that lets you write DOT code and invoke the library to get your pretty picture out.
You can also share a link to the page with the DOT code encoded in the URL, so bookmark to save your results!
Live Demo: (link), and screenshot below: